Revealing mistake: In the very early scene in which Zed points his revolver directly toward the viewing audience and shoots, it's visible that there is no ammunition in the gun's chambers.
Revealing mistake: When Herbie dives into the ocean, water can be seen coming out of the open back window, even though the next shot shows the inside completely dry and the window closed.
Revealing mistake: Whilst being followed by Celine, Julie walks up a small flight of steps. When this happens, a blue car can be seen turning around a corner and driving past the camera. Just as Julie walks into frame, the driver of the blue car can be seen looking at the camera just as he drives past it. (00:05:58)