I was watching Death on the Nile this morning, and after a murder takes place we the audience see that a gun is tossed into the river over the rail of a boat.
When the body is discovered, the detective instructs others to have the captain dredge the river to find the missing gun. At this point, the audience knows the directive has been given, and it's understood.
However, a few minutes later, we are shown a brief shot of the dredging taking place, and at that moment you hear an extra yell from somewhere "DREDGE THE RIVER!"
At this moment, anyone with half a brain already knows they are dredging the river - the order was given in front of us and we're literally watching them do it now. Within the reality of the movie, the extra yell makes no sense - they're already dredging, they're in the middle of it, why would someone yell "DREDGE THE RIVER!"
The purpose of the yell is because someone involved in the movie's creation felt the audience may not know what they're watching if they missed the previous related line of dialogue and are also quite dumb, and so they felt they needed this extra yell to make it extra clear.
Is there a term for that? Dialogue that makes no sense within the context of the story and is only there to condescend the audience with over-explanation of what's happening?