Continuity mistake: Rachel throws a couple of suitcases and Jamie throws 2 more and a sleeping bag down the stairs. Next shot shows a chair and boxes that were never thrown. (01:08:10)

Halloween 4 (1988)
Plot summary
Directed by: Dwight H. Little
Starring: Donald Pleasence, Danielle Harris, Ellie Cornell, George P. Wilbur
Michael Myers is being transported to a new hospital, when it crashs he escapes, he then goes on another murderous rampage involving his niece.
More mistakes in Halloween 4 More quotes from Halloween 4 More questions & answers from Halloween 4
Earl: Martians could land on Ben's doorstep and all he'd do is spit once and get himself a shotgun.
More trivia for Halloween 4
Question: How were Rachel and Jamie able to make the connection that Michael was Jamie's uncle?
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Answer: It's never explained who told Jamie of her murderous uncle, but Jamie is mocked and made fun of by her classmates for being related to the infamous Michael Myers. She could have been told by her adoptive family, classmates, neighbors, etc, but the movie never provides any definitive answers.