Leon (1994) - 4 major mistakes

Continuity: In the very first scene where Old Tony is debriefing Leon, we see Leon pick up his glass of milk and drink the entire glass. However, if you look at the reflection of Leon's glasses as he takes the glass away from his mouth, you can see that the milk is not finished.

Continuity: After Leon rescues Mathilda from the SWAT team and dodges the snipers, he shoots out a ventilation fan to make an escape route. The blast pattern in this sequence is all wrong. First off, the camera starts on Leon as he begins shooting. He gets off two shots before the camera switches to the vent, but when it does we see about 7 bullet holes around the vent. Then the camera goes back to Leon as he continues firing shots. When the camera is on the vent again, some of the holes that had been there previously are gone. Most notably a hole directly above the vent and to the right is no longer there, and the damage below the grate is significantly less than it had been.

Continuity: Before the dreadlocked man starts looking at the vinyl records in the apartment, he places his uzi down with the butt facing the camera. In the next shot the barrel is facing the camera, and switches back again in the next shot.

Continuity: In the scene where Mathilda returns to her apartment and takes the hidden stash of money out from the loose floor board, she leaves the board open and also takes the money out of the plastic bag and leaves the bag on the floor too. In the next shot, the camera angle switches to her looking down the hall because she hears people coming. When the camera switches back to the original angle of her scurrying away, the floor board is back in place and she's wrapped the money back up in the plastic - nowhere near enough time to do that.