Character mistake: When Missy is at her audition, Courtney and Whitney get annoyed and tell her to do a sequence, (front handspring stepout, roundoff back handspring stepout, roundoff back handspring, full twisting layout). However, when Missy starts the sequence, she starts with a cartwheel instead of a front handspring.
Character mistake: The sign for the hotel where Jake is staying at in Mexico says Tengo Quarto's para Renta. The word is spelled wrong. It should say CUARTOS. Also, there is no apostrophe s in cuartos. It is plural, not possessive.
Character mistake: When Stan inflates himself, Michael asks, "How'd he do that?", implying that he doesn't know the rules of the Looney Tunes world. Since Michael was rolled into a ball by the aliens earlier in the film, this shouldn't be too much of a surprise.
Character mistake: When Coach Fullmer is recruiting Michael and SJ to Tennessee, he ends the conversation by calling SJ the wrong name - "my pleasure, CJ." (01:33:25)
Character mistake: When Casey is using her knowledge of physics to advise a figure skater, she states, "Pull your arms in real tight. That increases your moment of inertia". In fact, this is the exact opposite of how it really works. Reducing her overall radius makes her rotational inertia smaller. (00:21:05)
Character mistake: When Rocky makes his speech after his fight with Drago, he says that it's better that one person fights another instead of a million fighting a million (a US USSR war). The Russian translator misinterprets his speech and says that this is better than a million dollars. You don't have to understand Russian (although I do) to hear the translator says million dollars to confirm this blunder of a mistake. (01:22:25)
Character mistake: In the Liverpool match the commentator says that Liverpool could win their 19th title, in the 1988-89 season Liverpool had 17 titles, and won their 18th title the year after in the 1989-90 season.
Character mistake: Chick Gandil mispronounces Eddie Cicotte's name, calling him "Si-coty" instead of "See-cot."
Character mistake: In the scene where the Panthers are being introduced, the announcer states that one boy is "Walter 'The Hook' Coster", and another is "Frank 'The Razor' Schmidt". But in another scene, when one of them is batting, he says Frank Coster. Although they look exactly the same, he accidentally mixed the two names together. There is no Frank Coster. (01:12:50 - 01:19:15)
Character mistake: When McConaughey and Fox are at West Virginia University to ask their coaches for help with their offense, McConaughey is shown talking while looking at his reflection in a football trophy. At first his reflection shows him talking out of the left side of his mouth, but then he quickly switches to talking out of the right side of his mouth as he does throughout the entire rest of the movie.
Character mistake: When Fish is offering Jack the contract to sell Henry to the Yankees, and later when Jack insults Henry's father, they both refer to Jack as Henry's manager. But Martinella is Henry's manager; Jack is Henry's agent. While the terms can be used interchangeably in other businesses, such as music, in baseball they are two separate titles with separate job descriptions.
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: During Mickey's MI it's stated that his blood pressure is 200/50 (that alone is ridiculous) and the doctor immediately says "OK. Let's start CPR." If Mickey has a BP he has a pulse, and any CPR certified healthcare provider would know that you can't do CPR on a patient with a pulse.
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: In the scene where Spider quotes from the Bible to Rocky before the fight, he quotes the verse as Zechariah 4:6 and then quotes the beginning of that verse but the end of another verse, 1st Corinthians 15:57.
Character mistake: At the very beginning, when Haley is in court, the cop says that the property damage from the previous scene looks to be about $14,000. Although we can't expect a cop to know the true cost of the property, the only things damaged were the large window and maybe the metal framework supporting it. The window couldn't be any more than $1000.