Continuity mistake: In the scene when "There's shit everywhere" in the bathroom, it is taking place at night. But in the shots of Jessica's dad in the bathroom doorway, there is sunlight coming through the window across the hall.
Continuity mistake: When the teacher asks her "special needs class" if they have any ideas for a float, the camera switches between people and conversations and every single time this happens the Chinese exchange student changes position (resting on her elbow, arms out stretched, hands together etc...)
Continuity mistake: Louis has a black eye from Lloyd hitting him while in his pirate costume, as Lloyd finds out when he is wearing the "polar wear". Then, in the special needs class that same day, we see Louis without the black eye.
Continuity mistake: When Harry is drinking his Slushy fast, some drips on his neck and leaves a stain. Then, when Jessica comes, the stain is gone.
Other mistake: If Harry was born in 1969 and is 18 when he attends school (based on "8 years later" then "10 years later"), then the year should be 1987, not 1986 as the movie states. (00:01:25 - 00:01:52)
Suggested correction: This isn't necessarily true. The +8 and +10 years don't have to literally be to the day. Maybe Lloyd hasn't had his 18th birthday yet - it could be days away, making 1987 valid. Lloyd was born in 1969, but I don't think that was indicated for Harry. Harry was "held back 3 years", so may have been born in 1968 in order to be in the same grade as Lloyd, who was held back two years. Otherwise, Lloyd would be a sophomore and Harry a freshman, which questions how they're in classes with jrs/srs?
First off, the mistake isn't focused on anyone's age, just the date. Second, we know Harry was born in 1969 since the film starts with his, so your comments don't make sense. It says 1969 and the 8 years later followed by 10 more years later, which would put it at 1987.
Continuity mistake: The chip of Lloyd's tooth on Harry's forehead is bigger than the piece missing.
Continuity mistake: When Harry and Lloyd fall through the ceiling, they start to walk down the hall, away from the ceiling debris, for about 20 seconds, but when the camera angle changes to their backs, they're next to the debris again.
Continuity mistake: When Harry and Lloyd are in Big A goofing off, when Lloyd says "invisibility shield", the store clerk is seen moving and bending over a bit to put something down on the shelf, but in the next shot, he's back in the upright position.
Continuity mistake: When the special needs class is debating a float, look at the chalkboard in the background. The word 'float' is underlined, then the next time you see it, it isn't underlined. This occurs a number of times throughout the scene.
Other mistake: When Lloyd asks Harry about the geeky girl, the clip of the girl is in reverse, hair shows the effect. (00:08:55)
Continuity mistake: After Lloyd breaks the window with his message via a large brick, the glass on the left side of the window sill keeps shifting back and forth 90 degrees from shot to shot.
Revealing mistake: When Harry and Lloyd collide, Lloyd's tooth goes into Harry's forehead. When he pulls it out, he doesn't even bleed, and it leaves a little mark. Also, the little mark from the tooth is gone by the next scene.
Factual error: In the scene where the principal is in the car asking about the chest. They pass by a house with a 1990's Chevrolet Suburban.
