Visible crew/equipment: When the punk Mikey was waxing his car, you can see a stage light in the reflection of the car.
Great sites
Mistakes
When Tina is in the car with who she thinks is her boyfriend but is really Michael Myers; watch her lips when she says the line "Nothing Mike, that's what I get, Nothing." It is obvious that this line was dubbed in over something else as her lips do not match that particular line. See more...
Halloween 5 mistakes
Factual error: When Jamie and the cop are in the room upstairs and Michael is breaking through the door, The cop shoots ten shots out of a revolver without reloading.
Continuity: The Myers house was a small Victorian house in all the others, but in this one its a huge gothic mansion!