Jack Frost (1997)

Revealing mistake: In the beginning, when Jack kills the guard then puts the cigarette out on his face, watch closely. As the camera pans down, you can see him starting to switch the lit cigarette in his right hand with an unlit cigarette hidden in his left hand so he doesn't actually burn the actor playing the guard when he "puts it out" on his face. It can be hard to notice at first, but once you see it, it's super obvious.

TedStixon

Trivia: Ironically, the winter was unseasonably warm when the film was shot, with some days hitting 70 degrees, so most of the snow seen on the ground is completely fake.

TedStixon