Is people making silly mistakes for no other reason than being dumb or ignorant a Chekhov's gun violation?
If a guard says "The reinforcement will arrive in 2 days.", but it turns out they will come 3 weeks late, and there's no other reason for the guard saying this aside his own incompetence, would that be a big Chekhov's gun violation? Because I never saw that unless the guard was a traitor or a spy. Is there a way to solve this, or make mistakes palatable by not triggering the Chekhov's gun?