Character mistake: During the movie, Stallone Lincoln Hawk is referred several times as 'Hawks' by other characters (the police officer retrieving him from his cell, as well as his former father-in-law, who should know his real name). Lincoln actually calls himself Hawkes before he crashes the gate.
Character mistake: When Barb introduces herself to Flint, Steve calls her a monkey, and she corrects him saying that she's an "Orangutang", pronouncing the G at the end. But the correct word is Orangutan, with no G sound. Barb would surely know this, as a genius ape.
Character mistake: When in the mineshaft Trevor says that magnesium is used in gunpowder. That is not correct.
Character mistake: When young Alan is talking young Sarah, he says that he found a board game at the factory. Alan didn't find the game at the factory. He found the game across from the factory at a construction site.
Character mistake: On the mailbox where Linus delivers his letter, on the side of the Mailbox is written "U.S Mail." That should be on the letter, not the mailbox. There should also be a period after the S making it U.S. Mail.
Character mistake: Near the end of the movie, Charlotte says she doesn't have the strength to climb down into the crate. Two seconds later, she climbs down to comfort Wilbur, then climbs back up. Even if she couldn't go all the way to the crate, she was low enough that Wilbur could have carried her there himself.
Character mistake: When the coach is eating a sandwich in the locker room, there is a headline in the paper he's reading that says, "Diamond Backs rattle Timber Wolfs..." Diamondback is one word and the plural of wolf is wolves. (00:45:00)
Character mistake: In the scene when they do the weigh in, the camera man recording Ben does not even have the tape door pressed into the camera, so nothing is being recorded.
Character mistake: Lucy refers to fear of cats as "ailurophasia", which is incorrect; fear of cats is called "ailurophobia."
Character mistake: Before he scampers inside to spy on the humans, Claudius tells the other animals, "I'm your mouse on the inside!" Maybe he should check a mirror while he's in there. Claudius isn't a mouse - he's a rat.
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: When looking at the newspaper about Chester Copperpot, the caption under his picture reads, "Reclusive scavenger claims, 'I have they key.'" It should read "I have the key."
Character mistake: At the ravine, upon learning that the bridge doesn't exist yet, Marty states to Doc "We can't wait a year and a half for this to be built". If you carefully look at the sign, it says the bridge is opening Summer 1886. That's under a year away, not a year and a half from Sept. 1885.
Character mistake: Before the junk man drives away he calls Mr Coggins "Bill." The correct first name is George.
Character mistake: When Jack offers to sell his cow to the butcher, the butcher says "There isn't much meat on him." Jack points out that the cow is a "her", but after the sale, he says to the cow, "Be a good boy."
Character mistake: When Gwen Piper is talking to Aggie in the soup pot at the beginning of the movie, Aggie addresses Gwen as Linda.
Suggested correction: Aggie says Gwen darling.
Character mistake: Gail reads right through Katie's poor excuse about crotcheting, and says she won't go to the ball "after what you pulled today with Guy." She did not do it (well she didn't do anything, but 'supposedly did') today, but yesterday. (00:31:00)
Character mistake: When Thunder Jack first arrives at the cabin to buy the dogs from Ted, you hear him yell whoa to stop his sled dogs. After Ted is sprayed by the skunk, Thunder Jack is explaining the proper way to stop the sled dogs and says that you yell "hook and brake".
Character mistake: The Daily Planet newspaper headline "New publisher for your favourite paper" has "favourite" is spelled the British English way. Since Metropolis is in the United States it should be spelled "favorite."
Character mistake: When we see the sign in the window of the music shop, it reads "This Week Dance Record" which doesn't make much sense. Surely it was meant to read "This Week's Dance Record."
Suggested correction: The construction might very well be part of the factory, a new factory building for example.
lionhead
The sign at the construction site said it was an "Executive Office Annex" that they were building.
Bishop73
Even though the sign said it was an Annex, construction was still being done outside of the main factory where Alan found the game. Not inside of the main factory itself.