Continuity mistake: In the 1978 flashback scene, Michael does not have 6 bullet wounds in his chest from when Dr. Loomis shot him moments earlier.
Continuity mistake: After fake Michael jumps from the 5th or 6th floor of the hospital, Tommy and the others just take a few seconds to get to the street.
Continuity mistake: The mental patient jumps from the window facing the ground. When the crowd gathers around him he's face up on the ground.