Revealing mistake: Near the end of the movie when Irene falls off the bridge and Charlie follows, and when the boy's helicopter comes to save them, it is cloudy then a split second later sunny, then back again throughout the entire scene.
Revealing mistake: Charlie tells Irene to jump from the moving train when he can't catch up to it. When Irene jumps, the train is standing still. It only appears to be moving because of clever camera manipulation. (00:58:00)
Revealing mistake: When Hank crashes the car through the shop, look at the barber's chair. You can see it's a stunt double for the actor.