Continuity mistake: The glass window in the door to Dr. Hill's office is broken so that the main character and his girlfriend can enter. Later when Dr. Hill and his severed head return, the glass is perfectly fine.
Re-Animator (1985)
Ending / spoiler
Directed by: Stuart Gordon
Starring: Jeffrey Combs, Barbara Crampton, Bruce Abbott, David Gale
Dr. Hill is defeated and Herbert is presumably killed. Dan and Megan escape but she is killed by one of the ressurected. Dan injects Megan with the re-agent.
More mistakes in Re-Animator
Swiss Woman Doctor: You killed him.
Herbert West: No, I did not. I gave him life.
Trivia: Based only very loosely on the story "Herbert West: Reanimator" by H.P. Lovecraft, taking great liberties with the original story. This was, reportedly, one of Lovecraft's least favorite among his stories, one that he only wrote in order to "pay the bills."