Revealing mistake: At the beginning of the voyage, in the shot where the camera pans around the ships (just after the scene when the sail is being unfurled) we can see a jet airliner contrail mark on the sky.
Revealing mistake: When Norman MacLean drops off Neal Burns after he falls asleep naked in the sun, Neal gets out of the car still naked with his clothes bundled in front of him. The camera angle switches to the rear view and the sunburn makeup on his back makes it look like he was wearing a bikini. His butt and back must have touched the car seat and rubbed off the makeup.
Revealing mistake: Very poor diopter work on the Las Vegas stage: the audience is "split in half", one part very blurry behind DeVito's head, and the other half crisp and clear.
Revealing mistake: Strangulation scene that uses a rope, the rope never goes around his neck. (01:53:00)