Plot hole: When Melanie goes to meet Jake at the beach, it is pouring rain. Her hair is soaked and her dress is wet and muddy at the bottom. When they arrive at the wedding reception, her hair is much drier and her dress is perfectly dry and clean. (01:38:25 - 01:41:40)
Plot hole: When Edward meets with his PI, he hands him pictures of Connie and Paul that were taken the day before. In these pictures, there are also pictures of her coming out of Paul's apartment wearing jeans and a raincoat. The day Edward "went" to Chicago, was the same day she and Paul went to the movies. The next day, when Edward met with his PI to get the info, she hadn't seen Paul yet. And the day Edward hired the PI to follow his wife, she had already come and gone from Paul's wearing another black dress. The PI would only have time to see them on the day of the movie trip.
Plot hole: The psycho coed murders her lecherous professor (played by William Shatner) by pushing him out a window. In the very next scene, she's driving around with his body propped up in the passenger seat of her car. She weighed no more than 100 lbs., tops, and Shatner was easily at least 250 when this film was made. No way she could have dragged him to her car and lifted his dead weight into the seat, no matter how much adrenalin she was pumped with. Physically impossible.
Plot hole: Since when do highly trained, professional police/SWAT operatives run lemming-like at perpetrators in an armoured assault vehicle with an M-60 in it? This wouldn't happen.
Plot hole: The fact that David becomes conscious after being hit and left back is dramatically fine but there is no aftermath - he misses to finish dealing with Ali and friends at that point.
Plot hole: When Hugh is walking near the park gate, he should have seen Marcus. Marcus was on the same side of the post as Will was.
Plot hole: In the final scene of the movie, right after the big car pileup, it appears that everybody but the main characters disappear. Wouldn't you think that with such a major car pileup, there would be at least a few people outside their car wondering what was going on?
Plot hole: There is supposed to be no power when the Dragonfly ship reaches the island, but the lights are still on. At first, I thought it was just a lighting trick, but you can see the lights are on in the tunnels.
Plot hole: When Delila finds out who Jimmy really is, she takes his tuxedo and is apprehended by the bad guys. She then turns on her homing device on her necklace. The office says it will take 20 minutes to get to her. From that statement to when the CSA finally arrives, Jimmy has time to go to Devlin's, write him a letter, discover water striders, find his suit, and get back to Delila and fight the bad guys. THEN CSA shows up. The timing is really off.
Plot hole: In the scene after Chris' disastrous lunch date with Caroline, he is seen signing autographs before getting into his limo; however, he starts making out the autograph to Amber before he has even asked her name. He tries to cover by then asking for her name, and acts surprised/shocked that it is indeed Amber. Both he and the fan start laughing before he spots Caroline and Rachel coming out of the hotel and pushes Jerry into the limo. (01:01:57)
Plot hole: When Pistachio and Jennifer go to the toy convention to find Bowman she says her name is Barbara, and Bowman invites her to his house. When Pistachio comes looking for her at the door (as the German Guy and the Snobby English Guy) he says he needs to talk to Jennifer Baker. Wouldn't he ask to see Barbara instead of Jennifer? Also Bowman knows her as Barbara and didn't say anything about him calling her Jennifer.
Plot hole: When the umbrella ops first get onto the train, rain has to power it up. There were plugs disconnected, and you see a hole in the fence as she shines a flashlight on it. It can't be anything infected because they didn't power down the red queen yet, and release the bioweapons. The red queen isn't physical, just controls systems. And with none of the zombies, or other infected loose yet, what else could have unplugged it? Spence was knocked out on the train, this seems to be a plot hole. (00:02:00 - 00:20:10)
Plot hole: The drug dealer guy gives Arnie a hood to wear so as to not see where they were going. When he puts it on we can see his face through it like a streched sock or something, meaning he could still see.
Plot hole: Shortly before the penultimate fight between Feathers and UB, Smart Brother comments that UB has a few seconds before the reactor goes. Yet, no matter how loosely SB's words are interpreted, the whole sequence from when he said that to when it blew lasted longer than "a few seconds".
Plot hole: During the nova scene, everyone is tying down the sails after securing themselves with lifelines to the mast. Jim and Silver are on the front and Silver is knocked off. Jim is then all dramatic and runs to grab Silver's lifeline which seems to be coming from above, and pulls Silver up like a pulley. How come? The lifelines were attached to the mast, so Jim's action is pointless... even if he could do it, because a shot later both lifelines are streaming right to the mast, leaving no room for a pulley of any sort.
Plot hole: When Diz is called into the Principal's office following the first game, he is questioned about the homecoming, which is scheduled in two weeks. In that two weeks, the football team goes through a whole season, including the state championship. When do they have time for school? (00:52:25)
Plot hole: Why wouldn't the police evacuate the area around the booth where an armed (they think) homicidal maniac is making a phone call? All those people would be well within gun range and the city would have been held liable had any of them been shot. Step one is usually to secure the scene for the safety of the public. (00:32:05)