Revealing mistake: When Austin enters the bathroom at the casino, keep your eyes on the door during the scene - it opens by itself before closing. (00:31:10)
Revealing mistake: When Fletcher is beating himself up he goes into a stall and squishes his head with a toilet seat. You can see that the white part underneath is made out of foam because it keeps squashing down.
Revealing mistake: When Will Smith throws a rock at the escaping Edgar alien, if you watch the rock after it hits the alien, it disappears after hitting the ground. (01:23:20)
Revealing mistake: When Holden is driving his Ford explorer, the speedometer reads that he's going 0 mph. (00:50:35)
Revealing mistake: At the beginning of the movie, when Melvin catches Simon's dog, he holds it away from him, with his arms stretched. When the dog begins to pee, you can see that the urine is coming out from Melvin's glove. (00:01:30)
Revealing mistake: When the boys go into the bear cave and all of the snakes are hissing, you can clearly see that one of the snakes is a rubber snake with a black stick attached to its head - the black stick is coming from a whole in the ground. It is not even a good snake, the 97 cent 'convenience store' variety.
Revealing mistake: There is one scene where Alicia Silverstone is being taken away, and in the window, in the background, you can see a metro train with the letters on the side stating BC Transit and a picture of the British Columbia flag. Yet, the whole movie supposedly takes place in Washington state.
Revealing mistake: While Wayne, Diane, Patty, and Gordon are in the laundry basket, Adam and Mitch carry that basket upstairs. When Mitch says, "I bet my parents wish I didn't have a medical problem," the camera turns to follow the boys as they walk up the stairs, and the left wall (with striped wallpaper) of the staircase is missing to accommodate the camera filming from that angle. It's visible again when Mitch says, "And I feel fine." (00:35:35)
Revealing mistake: When Captain Binghamton is giving his pre-invasion speech, the camera pans back and past a machine gun. The cartridges in the belt are just casings with no bullets in them.
Revealing mistake: Before Josh tells his mom about Buddy, Buddy starts to push the basketball with nose down the stairs. While he is doing this, you can see the treat put there just before the ball moves.
Revealing mistake: When Andy and Claude are fighting each other in the train, during several shots, you can see Claude wearing gray briefs.
Revealing mistake: In the end, Phillip lands in the chair and he stops bouncing. You think he would still bounce even though the chair was soft.
Revealing mistake: Wait until the end of the bonus footage of the Spice Girls' live performance of "Mama". At the very end of the song, the music and voices fade out. Sporty appears to throw her body and soul into one of the lyrics, even though the lyric is barely audible because of the fadeout. It actually looks pretty funny.
Revealing mistake: When Franklin leaps out of the helicopter into the water, there is a shot from above that we see he is about to hit the water. To the left of him in the water you can see the water being split by a helicopter close to the water. The waves wouldn't have been created from the helicopter he just jumped out of because, a)The helicopter was too high up to make that sort of marking in the water and b)The waves are being made to the left of the helicopter. If it was the helicopter Franklin jumped from the markings on the water would have be directly below him or below the helicopter.
Revealing mistake: When Haru looks through the phone-book, you can see they took a real phone-book and simply glued a strip of paper that had 10 rows of fake names and numbers over a section of it (leaving space to make "Tanley, Martin" stand out). You can also see the name are briefly out of alphabetical order because of this. (And anything seen that is not covered by the strip of paper is a real person's actual address and phone number).
Revealing mistake: When Oz goes to hack into the Scream 2 website, the exact same footage of him inserting the "custom" disk is used when he hacks into the security system - same red light, same angle, even same PC tower.
Revealing mistake: After Bill Murray breaks through the door with a hammer at Lori's house and says "Here's Johnny", he kicks the door open. On the back of the door you can see white tape, showing where to hit it.
Revealing mistake: In the scene at the end, at the Newberry house, where Blank and Grocer meet in the kitchen, you can see that Blanks weapon is empty but he keeps shooting with it. It goes empty when he reaches over the counter to shoot at Grocer, but he still manages to shoot the two persons coming in through the door from the garden afterwards without reloading.
Revealing mistake: When Ed and Dexter are in the ventilation shaft, watch when they fall in the trolley thing. If you look carefully you can see Ed's wig hanging on the edge. It's got a good burger hat on it.
Revealing mistake: When Georgie stands up at the roof-top pond, she casts a shadow on the background sunrise.