Collins' wife passes in front of Brick twice as she comes in to be questioned.
During the shooting in the garage, a bullet hole in the wall behind Brick disappears.
Brick Davis punches Jeff McCord in the chin, but when he gets up, he has a black eye.
When Collins gets out of the car following his wife into the lunch room, the distance between the door and lamppost changes.
When Brick sees Mac on the train in Washington, Mac's arm moves to the back of the seat.
A crashing automobile knocks over a street lamp just before it runs into a building. The lamp falls away from the camera, so that its bottom is exposed. Clearly the lamp is a prop with no electrical wiring.
When Robert Armstrong is riding in a car driven by a uniformed policeman towards the end of the movie, a crewman is reflected off the small passenger window. He shows up in three scenes and may be rocking the car to simulate a bumpy road.