Revealing mistake: When Loomis shoots the marshal's window out, when he makes a u-turn you can see the tire marks on the road and dirt from previous takes.
Halloween II (1981)
Ending / spoiler
Directed by: Rick Rosenthal
Starring: Jamie Lee Curtis, Donald Pleasence, Charles Cyphers, Jeffrey Kramer, Pamela Susan Shoop
Dr. Loomis (Donald Pleasance) finds out that Laurie (Jamie Lee Curtis) is actually Michael Myers' sister. He goes to the hospital and stops Myers from killing Laurie having her escape and Loomis blows himself and Myers up in the room....or does he?
Chris Papagikos
More mistakes in Halloween II
Mrs. Alves: Men! Can't live with them, can't live without them.
Trivia: Jimmy didn't die even though it never shows him after he faints on the steering wheel in the car with Lori. He simply passed out. The television cut shows him alive in the ambulance at the end, but for some reason in the theatrical version, they left it out for us to 'wonder'.
Question: How can Michael recognize Laurie as his younger sister since he wouldn't have seen her since she was only two years old?
Answer: There is a scene where Laurie dreams about meeting Michael as a young teen. It's unknown whether this is an actual memory of real events, but since nothing indicates otherwise, we could assume the he saw her at an older age when she looked closer to her 17-year-old self.