As a Catholic, with my entire k-12 education in Catholic schools, Catholics often get some unusual portrayals in media because the United States and England a predominantly protestant (from the Catholic Perspective, Anglican is protestant, just like every other non-Catholic sect of Christianity save for Eastern Orthodox.).
Catholics are also not evangelical as nor speaking of "accepting Jesus to save your soul." The Catholics belief is that Jesus already saved your soul when he died on the cross, and so long as you atone for your own sins with God, prior to the afterlife, you're good (this is why the most common depiction of a Catholic person living his faith is in a confession booth saying "Bless me Father, for I have sinned Mea Culp, Mea Culp, Mea Maxima Culp (Latin: Through my fault, through my fault, through my most grievous fault)". And the priests they confess to are not allowed to comment on any confessors sins outside of confession (my own Parish Priest was caught in a squabble with local police over this. Turns out, a murder had turned himself into the cops for his crime and told them that he did so as part of penance assigned to him by the Parish Priest and the cops came to the priest to verify the story, which per the sacrament, he could not do (in the US at least, the law is in his favor so he couldn't be brought as a witness in trial).). The murder is not bound to not talk about what he said in confession, so there's no weight on his immortal soul for this happening.
Catholism also doesn't take the Bible literally and looks for the metaphorical meaning of the works. You won't see a Catholic interpreting Portends of the End of Days from the Book of Revelations nor will you see Catholics insist the world was literally made in six days, plus a rest period or that God created all the animals as is without evolution. The Catholic Church was never opposed to Darwin's origin of the Species. Much to the contrary, Gregor Mendel, a Catholic Monk, conducted his famous Pea experiments in from 1856 to 1863, releasing his seminal paper on the results in 1865, work which would earns him the credit of creating the science of Genetics (While neither was aware of the other's work, Charles Darwin's Origin of the Species was released in 1849. Mendel's work was a continuation of his direct superior's, Abbot C.F. Napp, own work with sheep.). In fact, Saint Thomas Aquinas's (1225-1274) own theological works would discuss creation more akin to God planting a seed that would grow and change over time, and also proposed that the monsters of Greek Myth were not seen in his "modern world" was because they had all died off because there features were no longer useful to the world, which is similar to the concept of Niches and Survival of the Fittest. In fact the most famous charge of church ignorance of science, the House Arrest of Galileo, has nothing to do with Galileo's support of Heliocentric, but because the book he published defending Heliocentralism equated then Pope Urban VIII as an idiot who supported Geocentric theory. This naturally pissed off the Pope Urban VIII, not the least of which was because Galileo's patron of the work was Pope Urban VII himself (who was looking for a defense of Heliocentralism as the Church had recently introduced the Gregorian Calendar, which only worked because it assumed Heliocentrilism was correct and was named for it's most powerful supporter Pope Gregory XIII, which was the Pope two Popes before Urban VII. These facts were starting to become widely known and Urban VII decided he needed an expert to show the Heliocentrilism idea was in fact correct, and turned to Galileo, gave him a really good patronage at the time to boot). Further hurting Galileo, was that the order of priests who would support him, the Jesuit Order, were not fans of Galileo's following a dispute over comets 10 years previous. The Jesuits are famous for two things: scholarly persuits, especially sciences (to the point that seismology, the study of earthquakes, is so populated with discoveries by Jesuit Priests, it's often called "Jesuit Science") and their very strict military devotion, to the point that in Galileo's time, they were the defacto intelligence agency for the Vatican and the leader of the order, The General Superior, is often called "the Black Pope" for the office's tendency to come off as the power behind the papal throne. And this is in a time where Papal Authority was massively over powered.
Another fun little weirdness that gets comment on is "Catholics breed like Rabbits" sterotype and I won't lie, my church parking lot has multiple personally owned family vans that can seat 15 people comfortably parked there every Sunday (average vans seat 7). This is despite Catholics coming off as having taboos about sexual matters. This oddity has it's roots in that Catholic Doctrine holds that Sex is not in and of itself sinful... only sex without possibilty of a child. Among some Catholics, the large families are often jokingly called "Really Good Catholics" as the ones with more traditional nuclear family are more likely to have practiced safe sex. It's also why the Church recently made news when current Pope Francis said that being Gay is not sinful. It's not a new position (Pope Saint John Paul II held a similar position during his papalcy) but again, Francis was asked about people who were attracted to the same gender. Gay sex is still sinful.
All this said, much of what many modern Catholics will tell you about the faith is not entirely true of it in the 1900s. The Modern Church was brought about after a number of reforms in the 1961 Vatican II conference. The big changes to the church were that mass can now be said in the vernacular rather than then the Latin and the Eucharist could now be received in one's hands, rather than being placed on their tongue by the priest (or other administer, Large Churches will often have some of the laity assist the priest during the sacrament). There were many other changes but they are more minor (for one, women would wear head coverings to service, but not when going about their normal lives. They are often lacy and cover only their hair. Another one is a Monastic Order can now set it's own rules for it's religious community and not the vatican (and all Catholics were allowed to disagree with clergy on religious matters. BTW, Papal Infallibility is a real thing, but it only applies in certain circumstances, and must only concern religious matters. It's also very, very rare, and has happened at most 7 times in the church's 2000+ year history). Another big change was to he wording of the Confitor, which is said in the public part of confessions. The one depicted in Disney's Hunchback of Notre Dame is an accurate Confitor pre-Vatican II if you want an idea of what that would sound like (The Latin Chanting prior too and continuing through most of the the song "Hellfire", though the prayer does not end where the creepy hooded red monks portion of the song leave it. The chanting from the back half of the song after the monks is Greek, not Latin, and a completely different prayer entirely.). By the way, Hellfire is often thought of as the Best Disney Villain Song and its singer, Frollo as Disney's Best Villain, and Catholics surprisingly think this more so than most people. It's got a lot to do with the fact that the film isn't taking digs at the church, but through this song acknowledging Frollo doesn't really understand his own faith. I could write a paper as to why, but suffice to say, remember seeking forgiveness for ones sins is a big thing in Catholic teaching and Frollo is failing everything about how to do even that.
For that matter, there is a difference between Nuns and Sisters (and their male counter parts). Nuns are women who take sacred vows and are typically cloistered and live in nunneries or abbeys (the head of Nunneries is titled "Mother Superior" or "Mother Reverend" and the latter is called an "Abbess") which they rarely leave (usually for medical reasons) and usually support themselves by making food items such as jams or liturgical items to be used in mass. Their male counterparts are Monks who have Monistaries or abbeys (the head is an Abbot... if you meet one, don't greet them with "Heeeeeey Abbot!"... especially if you're addressing Abbot Costello, trust me, he's heard it before.). Nuns can be addressed as Sisters as can Religious Sisters who are not Nuns. Religious Sisters take simple vows, live in a convent. Vows are renewed annually, so they may leave their orders, but the most notable aspect is that they typically practice their religious duties by ministry to the public where as nuns by praying for a specific cause. Such ministries of Sisters include hospitals, charities or caring for a communitie's poor, and most famously, teaching in Catholic School (in a modern setting, a Catholic school doesn't have many sisters these days, as the profession is on the decline, but every character who goes to a Catholic School speaks in hushed horror of Sister Mary Joseph and her dreaded Ruler. While they can be strict (to the point that your standard torture master has nothing on the hero compared to the sister that taught his math class), Sisters tend to be depicted as having a much better sense of humor than Nuns, and will often be depicted as the younger and more sunny personality next to the older dower nun. Two Movies that get their depictions of the differnce are Sister Act, where Whoopie Goldberg's character is placed in witness protection in an Abbey doesn't know the difference and gets admonished for trying to help the minister to the community which the Nuns do not do. Additionally, Maria from "The Sound of Music" is a Religious Sister who is contemplating a move to an order of Nuns. All of this is more to show your work as Vatican II has relaxed a lot of the stricter parts of Monastic Life and the fact that both members are addressed as "sister" results in most lay Catholics not knowing the difference too. As to why they appear in those films, Sound of Music predates Vatican II in story and production while the Nuns in Sister Act are fairly old, being led by Mother Superior Proffessor McGonaclle, who's formality isn't atypical of a Catholic who was fairly conservative in what the accepted of Vatican II (no that's not the character's name... she was just played by Maggie Smith).
And one quick note, a Catholic Priest is always addressed as Father by a Catholic, never Reverend (despite most priests using Reverend in their stylized name).