Continuity mistake: Near the end of the movie, when Parker and Hunt are on the bus going to the contest, you'll see that Parker's hair is in waves. But when she arrives at the studio, her hair is VERY curly. Its not likely that she had time to change her hairstyle THAT drastically if she was pressed for time as she very clearly was.
Factual error: A native French speaker like Monique would never mistake the word 'testicle' for 'tentacle'. The French word for 'testicle' is 'testicule' and the word for 'tentacle' is 'tentacules' - both are pronounced almost identically to the English form. She'd have to confuse the two words in French, and not even a non-English speaking French person would make a mistake like that. Monique's English is very good. She'd be perfectly aware of what she was saying.,.
Continuity mistake: During the storm of Lisa's creation, when Wyatt shouts to hang up the phone, Gary leans over Wyatt's arm and places the handset back onto the phone base. However, after Gary shouts, "What's going on?" the handset is still on the modem.
Continuity mistake: Glenn Close's outfit changes four times during the same courtroom scene, while she is giving her opening statement in front of the jury.
Continuity mistake: When Denys Finch-Hatton takes Karen Blixen on a flight in his open bi-plane, he hands her a pair of goggles just before they board the plane. As they sit in the plane she is goggle-less and he hands her another pair.
Character mistake: When Schaeffer, McFee, and Fergie walk down the dusty road to Amish village, Western gunslinger style, they make a silly mistake no cop would make - they assume that Amish villages are unarmed and undefended. No so. The Amish have no prohibition on guns and almost every house would have at least one hunting rifle or shotgun. The three bad guys are risking being shot to bits before they get halfway down that hill; they don't even make an attempt at concealment. (Wouldn't they also at least think John - a police officer - would still have his gun or might have got hold of a firearm from the Amish?)
Revealing mistake: In one scene, when Jack is in the dungeon talking to the fairy, you can clearly see that the "fairy" is nothing more than a light on a thin piece of wire. The wire can be seen quite clearly for two shots.
Continuity mistake: Towards the end of the movie at the prom, Terry finally shows Rick that she's really a female. She exposes her breasts. Now obviously she's not wearing a bra. But in the next scene you can see she's wearing a lace one.
Continuity mistake: When Jack, Joan and the Jewel are trying to jump on the moving train, Joan is wearing slip-on shoes, however once she has jumped onto the train and falls over the side her shoes have changed to buckle sandals.
Audio problem: When Philippe climbs up to the grating in the church, a little girl talks to him, but her mouth does not move.
Continuity mistake: When John Cusack is getting ready for his date with Daphne Zuniga, he unzips his trousers to tuck in his shirt twice.
Continuity mistake: In the scene where everyone is going to the Tanning Invitational, Chris grabs two Hawaiian Lei's and a straw hat from a girl at the door. He puts a blue lei on Mitch and holds on to the red one and the hat. The shot switches to just Chris and when it goes back to Mitch he has on the red lei. Back to Chris again who talks a little more then reaches over and puts the hat on Mitch's head, who is again wearing the blue lei.
Continuity mistake: In the match between Loudon Swain and Chute the ref awards Chute 2 points for a take down, while in a referee's position, but in a real wrestling match you do not get 2 points for being on top in a referee's position.
Continuity mistake: In the bar scene when Billy is playing the saxophone on stage, his wife enters the bar with her boyfriend. The saxophone music keeps playing after Billy starts glaring at them, even though Billy has stopped blowing air into the horn and is not pushing the horn's buttons.
Factual error: The KGB agent hunting Jonathan is carrying a Spanish Campo-Giro pistol. There's no way a KGB agent would carry a foreign sidearm in a Soviet Bloc country, especially one that was phased out of service in the late 1920's.
Other mistake: During the epic love scene between Helen Shaver and Patricia Charbonneau, look carefully at a closeup shot as Patricia kisses Helen. Parts of each one's hair is inexplicably wet and they haven't been fooling around long enough to sweat.
Factual error: In the shot of Florence with several bridges and the river shown, cars and motorbikes can be seen going across the lowest bridge in the shot. (00:10:10)
Continuity mistake: When the lads run over the fire hydrant in Jonathan's father's Studie, the bumper appears undamaged. However, when they pull up in front of his house, the right side of the bumper is badly crumpled.
Factual error: There is a scene in which the Catholic high school boys are lined up to go to Confession to a priest. One of the minor characters is a compulsive masturbator, a recurring gag in the film. He is trying to estimate how many times he has wanked since his last Confession, and Kevin Dillon's character takes out a digital calculator to help him figure it out. The film is set in 1965, about 8 years before personal calculators hit the market. (I was precisely the age of the characters in 1965, and we would have sold our souls to the devil for such a device. It was still science fiction!).