Character mistake: While watching a documentary about the Soviet team Herb Brooks says that the Soviets had had 42 games in the last three months with 42 wins. This was supposed to be said in 1979. In the whole of 1979 Team USSR played 24 games only, winning 23 of them and losing Game 1 of the 1979 Challenge Cup, to the NHL All-Star team.
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: 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: When in the mineshaft Trevor says that magnesium is used in gunpowder. That is not correct.
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: 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: 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: 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: 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: 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: 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: 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 we see what is happening inside the saloon, there is a sign which reads "Noisy - Is'nt It?" It should read "Isn't."
Character mistake: On the side of the boomerang box, there are words reading "Return's to owner." It should read "Returns to owner."
Character mistake: When Holly and Amber go to see Amber's uncle at the Bistro, they say the 'report' is due tomorrow. However that day will be Sunday (no school!), as previously it was mentioned that the day was Saturday.
Character mistake: When Sam pushes Freddie off the plane, his mother puts on the parachute and jumps out as well. She is in such a hurry, that she doesn't buckle the straps across the front. In real life, as soon as the parachute is deployed, the resistance would cause the parachute to come off and she would likely fall to her death.
Character mistake: After the dodgeball game ends Jerry asks the referee if skyzone had a bar, but in the background he's already walking away.
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.
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.