Character mistake: Queen is an attorney and should know how to conduct herself as a passenger in a car pulled over by police, yet she fails to behave in an acceptable way. Even though certain things may be permissible under certain circumstances, a lawyer should know exceptions and extenuating circumstances, but she apparently does not. She did not have the right to interfere with a police officer and "demand to know" or get out her cell phone to record if she was told to keep her hands where he could see them. (00:10:25)
Character mistake: When Kathryn reads the journal copy in the final scene, the camera shows some pages she reads. At one moment, one of the headings reads, "WORLD OF FREINDSHIP".
Character mistake: When Barry and Rob are in the record store discussing Evil Dead 2, Barry makes a comment about someone offscreen making shotgun ammo in the 14th century. That plot point refers to "Army of Darkness" (the third installment the Evil Dead series), rather than Evil Dead 2.
Character mistake: In every scene George is with Mary, she never once wears glasses. However, when he meets her coming from the library after he was never born, she is wearing glasses. George is shown how he has influenced all the people in Bedford Falls over his lifetime, but having Mary's eyesight degrade to the point of needing glasses isn't one of them.
Character mistake: In the very first scene in the film, the magazine covers are flashing up. There is an article called 'How to get a better bod in 5 days.' If you read the beginning of the article it says 'It Can Done.'
Character mistake: When we first see Sophie her body was slumped over (the spell to make her old) but later on in the movie, her back magically seems fine. (00:00:01 - 01:50:00)
Character mistake: When Billy comes back from high school to visit his 3rd grade class, Ms. Vaughn is teaching prime numbers. The board reads "1, 3, 5, 7, 11" with the words "prime numbers" below it. "1" is not a prime number and it is written on the board, and "2" is a prime number and it is not written on the board.
Character mistake: When the Tradewind arrives at the island, captain Hilliot says, "They might not be civilized," to which Richard replies, "Civilized: c-i-v-i-l-i-Z-I-D."
Character mistake: At the party when Michael tells a girl he's thinking of getting a Toyota Tercel, he says it has dual side airbags. The Tercel was never available with side airbags.
Character mistake: At one point Michael J. Fox says he doesn't want to end up in Danbury Correctional, why not? The Federal prison in Danbury CT would be a dream come true since he would be the only male inmate, as it became all-female in 1993.
Character mistake: During the military parade, check the lady behind the soldier on the left. She can't help stare at the camera the whole time before the soldiers arrive. (00:07:03)
Character mistake: When we see the door to Elisabeth's, her name is spelled with a s. Later when Nick looks her up on the computer, it's spelled Elizabeth.
Character mistake: At the beginning of the movie, during "Provincial Life", we see a fat lady trying on a hat in a hat store. The sign over the window, in French, reads "Chapeau" (hat). The correct way to identify that store would have been "Chapeaux" (hats) or "Chapelier" (hatter).
Character mistake: Circus Liquor is actually located in North Hollywood, not Sun Valley (although Sun Valley is just a few short miles away from there).
Character mistake: Stephen Baldwin is alternately referred to as Mark and Luke Dodge, without explanation as to which is his real name.
Character mistake: In the scene at Kerim Bey's office, when the bomb goes off, we see a heavy desk topple over. Bey says he was saved because he was relaxing on the couch with a girl. But he wasn't at the desk before either. He was sitting in some sort of sofa arrangement in a different corner of the room. We don't even see the desk before the bomb goes off. (00:32:05)
Character mistake: Claudia says she is 40, her daughter is 16, it is referenced that it was a young pregnancy, however she would have been 24 when she had Kit, hardly abnormally young.
Suggested correction: 24 is still young and she doesn't say anything about being "abnormally young." Plus, in 1979, the mean age for first time mothers was around 25.5 (rising to around 28.6 in 1995), so she was on the young side of first time mothers. If she had said she was a teenager when she got pregnant, that would be a mistake.
Character mistake: Joe Dirt mistakenly refers to his 1967 Plymouth GTX as a Road Runner while talking to Jill at the carnival.
Character mistake: Jo says Laurie is a "captive like Smee in 'Nicholas Nickleby.'" There is no such character in "Nicholas Nickleby." The character Jo is referring to is named Smike.
Character mistake: When Mollie goes to Albert's office for the first time since having Mickey, Albert asks if he is walking yet, and she says no. In the next scene with Mickey, he walks, and is walking when he visits Albert's office.