Continuity mistake: When Michael enters the Elrods' home and steals the knife, as he picks up the knife from where Mrs. Elrod had left it, there are several drops of blood that fall onto the lunchmeat, presumably from Michael's injuries from having been shot. A few seconds later when Mrs. Elrod walks back over to the lunchmeat and reaches for the knife and sees the blood, the droplet patterns are different.
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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
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Question: How can Michael recognize Laurie as his younger sister since he wouldn't have seen her since she was only two years old?
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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.