Other mistake: When Josh and Cher are driving home from a party, they show a shot of the car. It's a blue sports car that passes a Hertz car rental sign. When Elton is driving Cher home from the party in the Valley, they show the exact same shot of the blue sports car passing the Hertz car rental sign.
Continuity mistake: When Cher is held up by the guy with the gun after the Valley party, he tells her to get down on the ground. Take a look at her necklace - it's a small silver heart on a silver chain. She gets down on the ground, counts to 100 and gets up again. Check out the necklace now - it's still the silver chain, but the pendant on it is one of those nameplates that says 'Cher'.
Visible crew/equipment: Near the start, when Cher picks up Dionne in her Jeep, in Dionne's two closeups when she shows off her hat and when she says, "Well at least I wouldn't skin a Collie to make my backpack," the shadows of film equipment, crane and rigging are visible on the lawn as it moves along with the girls.
Audio problem: When Cher and Tie are at the party and Travis comes up to them he has 2 cups of some kind of drink and all of a sudden you hear a sound that is supposed to be something spilling. I guess they assumed that it was supposed to be the beer spilling on Cher's shoes. Well as you can see nothing falls/spills from the cup, it is just sound effects.
Other mistake: On the back of the Clueless movie box, it says that it is "not easy being the most popular girl at Beverly Hills High..." but Cher goes to Bronson Alcott High School in the movie. The name is said and there are also a couple of scenes where you can see the initials BAH - most noticeably on the sweater of the gym teacher when Cher is trying to get her grade changed.
Continuity mistake: When Tai is being held over the railing at the mall by the guys from Foot Locker, Christian begins to run towards her as soon as she screams. There is a shot of Tai, and then back to Cher and Christian. But Christian's motion resumes from exactly where he had been in the last shot of him, despite almost two elapsed seconds.
Continuity mistake: When Cher is taking her driving test and is supposed to be changing lanes, she almost hits a biker. But if you look closely when she is actually just hitting the biker you can see that it is not her, but a professional driver. The next shot then goes back to being the real Cher.
Continuity mistake: When Cher is helping Josh and the other lawyer go through depositions, and screws up, the other lawyer yells at her and she runs up the stairs crying. However the view switches to Josh with the staircase behind him when she should still be in view on the staircase and she's not there.
Continuity mistake: When Dan Hedeya is sorting the mail, there is a close up of two peices of mail. The first is a letter addressed to Melvin Hamilton with 90210 zip code. The second piece, Cher's report card, is addressed as Cher Hamilton with the zip code of 90212. Cher's last name is Horowitz, as established earlier in the film.