Continuity mistake: Although I understand the fact that H20 didn't want to include the Halloween 4, 5 and 6 timeline, Michael was burnt to a crisp by Dr. Loomis in the epilogue of Halloween 2, so he should have a fully burnt body. Also Michael was shot twice by Laurie in Halloween 2... He would have at least had scars/damage to his face in H20.
Suggested correction: This is addressed and left unexplained in the film, as Laurie's son doesn't believe Myers could have possibly survived the events of 'Halloween II' but apparently has anyway. We are left to speculate whether 'Halloween II' had truly ended the way we had seen, or if the recent killings were not actually by Myers but a copycat stalker, or if Myers is supernatural, etc. Viewers are free to consider this a bad or stupid choice if they wish, but strictly speaking it isn't a mistake.
Suggested correction: Michael's vision is also fine despite losing his eyes to gunfire at the end of Halloween 2. He can regenerate far better than most people.
Plot hole: At the end of the film all the police and ambulance vehicles manage to get into the school, but earlier Keri/Laurie smashed the mechanism that opens the gate.
Suggested correction: There's been a series of murders tied to an infamous serial killer... more than likely the police broke down the gate to gain access. (Which can be done in any number of ways: sawing through the locks, having the fire department dismantle it, ramming through it with an armored vehicle, etc.) They're not going to not come in just because there's a gate they can't open. Also, a quick Google search indicates that often, police are given access codes or ways to remotely open gates at certain buildings (schools, senior centers, etc.) in the event of an emergency. So it's entirely possible they also had a way to open the gate without breaking it down.
