Revealing mistake: During the party scene, when Jacob starts hallucinating, you can see the stick that one of the fake birds is attached to.
Jacob's Ladder (1990)
Ending / spoiler
Directed by: Adrian Lyne
Starring: Ving Rhames, Tim Robbins, Danny Aiello, Jason Alexander, Matt Craven
Jake died in Vietnam. The movie is the result of his spirit which doesn't want to accept his dead and clinges to life (the idea of this is told by Louis, a less convincing interpretation is that it is a hallucination shortly before his dead). Once he "accepts" his dead, he goes "to heaven".
More mistakes in Jacob's Ladder
Jezebel: Jake, New York is filled with creatures.
Trivia: Macaulay Culkin, although playing a truly pivotal role, is not credited. Pretty peculiar, huh?