Character mistake: At Henley, Prince Albert of Monaco is introduced as "His Royal Highness Prince Albert." He is a Serene Highness, not Royal. A British VIP would know the difference and say "His Serene Highness" instead.
Character mistake: Dwanye Johnson is called onto the ice, the first thing he does is throws a player through a glass pane. The player looses a tooth. The close up shows that the tooth is a molar, but the commentators say, seconds later, "Ohhh that's an incisor!" (00:01:00 - 00:02:35)
Character mistake: In the New Orleans scene in the cop car he calls in an officer down and describes the black vehicle as a Tahoe, but it's a GMC Yukon. He also describes the suspect as "Male, black suit and tie" but when he exits the vehicle they are both blue.
Character mistake: Sir John describes St. Columbanus as a gypsy from the East, but in fact St. Columbanus was Irish and founded one of the first monasteries in Scotland (on Iona island), one of the most important in Christendom.
Character mistake: After Reed proposes to his girlfriend, he calls Julia and leaves an excited voicemail telling her he has huge news. When Julia listens to what is supposed to be the same voicemail, the wording and tone are completely different, leading Julia to think something was wrong, such as his girlfriend declining the proposal.
Character mistake: Engine #1206 is instructed to take the nearest siding upon hearing the news of the oncoming train. Frank does the maths and determines that they will not fit into that siding. He states the siding being 4011 feet between signals, with about 2500 of actual usable space. Engine #1206 with 25 cars would only equal 1580 feet, giving them more than enough room to clear in the first available siding.The average length of a railroad car is 60 feet. Even if the cars were considered "long", total 25 cars would have fit into that siding.
Character mistake: In the scene where Stewart calls Nicole at the end of the movie, he tells her that he got a horse shot in the leg, when in fact they showed him getting the shot in his neck.
Character mistake: In the scene when Dave is checking out the failed transmitter at the radio station, Dave says "the bad news is your return loss - way too high". This is a mistake, as the movie makers got confused between the terms "return loss" and "insertion loss". Dave should have correctly said either "your return loss - way too low" or "your insertion loss - way too high".
Character mistake: After Gru tucks the girls in for the night, Dr. Nefario tells him that there are 48 hours until the rocket's scheduled launch. The rocket launch, then, should have taken place at night, around the time the girls go to bed, two days later. The rocket, however, launches during daylight hours.
Character mistake: Will Ferrell is talked into shooting his gun at the ceiling. Keaton comes from his office and takes his gun and gives him a wooden one. When he takes the real gun, he unloads the magazine from the gun but fails to remove the round in the chamber. He's a cop, he should know how to safely handle a gun.
Character mistake: Mattie attended a travelling Old West show in Memphis in which Rooster Cogburn was a performer. The flyer for the show shows the date of the show as July 18, 1903. The day of the show Mattie was told that Rooster died three days earlier (July 15, 1903). But Rooster's tombstone lists the date of his death as August 12, 1903. (01:41:55 - 01:43:35)