Plot hole: Where are all the graduating students? The ones that are going to be seniors the next fall are established. But what about the ones who graduated? There is absolutely no sign of any one of them anywhere, not at the Emporium, that at the outdoor party, nowhere.
Suggested correction: When Randy, Tony, Mike and Cynthia are all standing outside the classroom trying to convince Tony to come to the party, Mike mentions that all the graduating seniors are away on their senior class trip.
Plot hole: Just after Rita rescues Jeff, Diane's grave is seen close to where Jeff was buried alive. Even though Diane's been dead for several years, her make-shift grave site looks like it was freshly dug. There are no fallen leaves or other debris on top, no new vegetation (moss, grass, weeds, etc.) of any type growing on it, nor has the mound of dirt settled, shifted, or been affected by the weather.
Plot hole: Foster served in the military and even received a Purple Heart as indicated by the plaque in his mother's home. Yet he needs a kid to explain to him how to handle an M72 rocket launcher. A weapon introduced in the 60s and thus well within his time at the military.
Suggested correction: Not everyone in the military knows how to use this particular type of weapon. In fact, probably most don't.
Plot hole: Towards the end of the movie we see Mr. Wilson peek out from his front porch, surprised to see Dennis biking back home with his wagon carrying Switchblade Sam, tied-up and partly unconscious. Either Dennis must have some hidden super-strength or knew how to tweak the laws of physics there is no way that an eight-year-old kid of his build could carry an adult of that size to his wagon let alone easily bike home with Switchblade Sam's weight. Plus being an experienced criminal like Switchblade Sam he may have offered some resistance in being caught doing so much less submit to a mere kid. (01:50:00)
Plot hole: In the scene in the hotel, David sees the victim's head on the floor after the killer left. Later when David is in a hospital bed he is watching TV and the reporter claims that all the heads were in Judd's car. The killer would have had to have gone back into the hotel room to get the head of that victim after David saw it. She would have put it in her bag right away if she was saving them all. The bag was even left behind. (01:12:30 - 01:25:00)
Plot hole: There's a number of strange things about Butch's and Terry's escape: When the grid falls down the very loud noise passes unnoticed. After they climb down the tied bedsheets Butch pulls once and it comes down, although no-one tied it loose. And finally, their escape route ended within the prison walls, and they needed to kidnap the clerk, who had come back into the prison to get some papers, for the escape in his car, something which wasn't planable at all. (00:05:40)
Plot hole: April and Kenshin switch place in time as they were - by some extraordinary coincidence - holding the scepter "at the same time" (if the concept makes any sense) in the exact same pose, with a switch that takes several second of intense lightning storms and 'tornado weather' as one of the Turtles put it. Here there is the assumption that 4 priests would be around the scepter exactly at the same time, and when the Turtles do switch with Norinaga's elite soldiers instead they certainly were in completely different poses, far away enough to ride horses, who did not get spooked one bit by the lightnings and sudden winds but rode as if nothing happened.