Revealing mistake: After Bill Murray breaks through the door with a hammer at Lori's house and says "Here's Johnny", he kicks the door open. On the back of the door you can see white tape, showing where to hit it.
Revealing mistake: In the scene where Lori is putting on her coat as she is passing the curtains on the window there is a glitch and then there is a man walking down the alley way. In the DVD audio commentary the director of the movie admits to this problem. He said they shot this scene in a studio and then put in the man walking down the street later.
