Plot hole: Since this was to be the last Halloween movie, there is still a major plot hole with the way things went to make Halloween Resurrection. Yes, Michael switched outfits with the paramedic. In Resurrection, one of the nurses says, "Well, why didn't the paramedic say something?" She responds that his windpipe was crushed. Yes, this prevents him from speaking, but it doesn't prevent him from taking off the mask, proving it's not Michael.
Suggested correction: He was thrown through a windshield, hit by a van, and pinned between a tree and the same van. The fact that the mask was on his head might not registered right away. It's not surprising that it would never occur to him to take the mask off if he's groggy from the ordeal.
He was reaching for the mask, as if surprised he was wearing it, while pinned. I do understand your point, but I wonder why he didn't point to his face or at least try to remove it since he was obviously (in my opinion) aware of its presence at that point - and unable to speak due to his larynx being crushed. My biggest concern was that the authorities didn't remove the mask at the scene nor before loading him into the coroner van. Neither did Laurie/Kerri. Suspish.
H20 was meant to be the last film in the series and Michael was supposed to be killed off for good. The problem was created when they made the next film. So if anything, the mistake should have been included on that film's page, not on H20's.
Factual error: As we see in some of this series, Michael pins his victims to the wall with butcher knives. A kitchen knife isn't capable of holding a person's body weight pinned to a wall.
Suggested correction: Sure, it can. If it's a full tang knife jammed hard enough into a stud, especially given Michael's seemingly superhuman strength, it could definitely support a body.
No. There wouldn't be enough knife jammed in the stud to support a body. The average man has a chest depth of about 10", and Michael is shown using regular-sized kitchen knives, which are typically 6-12" in length... and that includes the handle. Honestly, none of the knives Michael uses would realistically be long enough to go all the way through a man's chest, let alone embed themselves into the wall behind the victim. So it's 100% impossible as depicted. This is simply a suspension of disbelief situation where the filmmakers knowingly included something completely unrealistic and impossible because it was a great visual. So it's 100% a mistake... but it's a cool mistake because it looks great on camera.