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.
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: When Ms. Heller is talking to the tour guide at the museum, she offers her a $5 bill to take the tour twice. How the bill is folded and held changes. When Ms. Heller says do the tour twice it's pinched between her fingers, then it's folded in half. It keeps switching between folds. (00:35:19)
Suggested correction: I didn't see it folded at all. The "other half" or part of the $5 bill that you can't see is actually squished/crumbled in the palm of Heller's hand.
The mistake is partially valid, its position changes. You seem to be talking about when she has the $5 and camera in her hand. When she says do the tour twice, it's pinched between her fingers, then in the next shot, it's folded in half, then she's pinching the end and the other end is unfolded, then back to folded in half.
Regarding the "folded in half" - the $5 bill is folded, but VERTICALLY. The differences that are shown appear to be deliberate SLEIGHT OF HAND. Heller is flashing the whole $5 bill at first, then crumbles it (symbolizing it "going away"). By having the $5 folded vertically, Heller was able to quickly fan out the left side (part equivalent to a flat $5 bill), then hold the $5 to resemble a bow tie. Folded vertically, the $5 bill could be manipulated to look different and more or less appealing.
She never crumbles the $5 bill during the part the mistake occurs. The way she's holding the bill changes between shots, meaning no time elapses, so there can be no deliberate sleight of hand.
Or would that be HORIZONTALLY? The $5 bill is folded to be long, not short, if this clarifies what I'm trying to say.
Factual error: This happens during the scene when Harry and Lloyd offer the little boy 5 dollars to get them slushies. This movie is set in the 80's but notice the $5 he gives him. It is the newer issued $5 that came out in the 90's.
Revealing mistake: In the scene where Harry and Lloyd first meet by running into each other, when it shows it in slow motion, you can see Lloyd brace for an impact when he's not suppose to know Harry is coming.
Revealing mistake: When we see the slow motion replays of Harry and Lloyd colliding, you can see that Lloyd's tooth doesn't touch Harry's head. In fact, their heads completely miss each other.
Revealing mistake: In the scene where the guys get the flagpole wedgie, we see Lloyd's coat being pulled up by invisible wires.
Factual error: When the guys are playing "it" in the Big A store, you can see Dasani and Mountain Dew Livewire - drinks that have only been around a few weeks/years.
Continuity mistake: In the scene were Lloyd finds Harry's "treasure chest", you can see that the chest is laying flat against the wall, but when the Principal and the lunch lady come and find it missing, there is a small dirt outline, as if the chest was pointing out from the wall, instead of larger outline, as if it were flat against the wall.
Revealing mistake: In the scene where Harry is going to Jessica's house on the waxer, if you watch carefully most likely you'll catch the last person who falls is wearing roller-blades like the kind that look like shoes.
Revealing mistake: When Jessica is riding in the principal's car they pass a gas station where there is a white late 90's/2000ish van. This film is set in the 80's.
Factual error: In the scene where Lloyd puts on a record on over the loud speaker to get ready for school in the morning, it plays Ice Ice Baby. This song was first released in 1990, whereas the film's set in the 80's.
Continuity mistake: When Lloyd is at Harry's window trying to wake up with him, the shards of glass on the windowsill keep changing positions. In the final shot of the scene, they have disappeared altogether.
Continuity mistake: When Jessica is chasing the bus to the museum, her hubcap comes off after she goes airborne over the hill. It is back on in the next shot.
Visible crew/equipment: In the scene where Harry and Lloyd are drinking slushies Lloyd starts to tell Harry "you gotta go fast Harry", right then you can see something black covering up Lloyd's "cracked tooth" proving that it's not cracked.
Continuity mistake: When Lloyd is sticking the napkins on himself in the cafeteria, you can see he is wearing underwear under the napkins, while in the next shot he isn't.
Continuity mistake: When Harry and Lloyd first collide, if you look carefully you can see that Lloyd still has his entire tooth when he falls. It was supposed to be chipped.
Factual error: Throughout the movie, Lloyd and Harry often drink Slushees. However, Slushee was not a company until 1996.
Continuity mistake: When Jessica and the principal are in his car watch the driver's side mirror. When Lloyd and Harry are following them you see a side view of the car and it has a regular teardrop mirror. After Lloyd and Harry get ice cream the principal is telling Jessica no one will be looking for her and the side view mirror has gone to a big square truck mirror like welded to the door.
Revealing mistake: In the shot when Harry and Lloyd are holding on the principal's car while riding in a shopping cart, the speedometer on the principal's car reads zero, while they are rolling forward with some speed.
