Revealing mistake: Right at the start of the movie, Tom Ewell is in Central Station kissing his wife and son goodbye. When they are just about to leave, watch a kid on the left of the screen. He can't help staring at the camera.
Revealing mistake: Immediately after the tomato plant falls on Tom Ewell's lounge chair, we see Marilyn Monroe on the balcony above, and to her right is a fake brick wall prop.