In the opening scene, which shows Reno throwing the pass to Jack, when Jack says,"His knee is smashed, his career is over", it shows Reno on the ground in pain holding his right knee. But before they replay the game, in the locker room, it shows Reno injecting his left knee.
At the football game at the end of the movie, it starts to rain for a while and then it stops. Gigi is shown on the bleachers with wet hair and then a second later her hair dry and fluffy.
In the final screen Jack walks up to his wife holding the football. The football disappears and re-appears as they walk off the field.
The last pass Reno throws to Jack is shown in the air a couple of times and is very wobbly. Just before it falls into Jack's hands, it's a perfect spiral.
The mascot throws a bucket of paint over Gigi's green dress in the nightclub, a uniform amount about a foot above & below her waist. When she is shown minutes later, the pattern of paint on her dress is completely different.
When Jack and Reno arrive at the house for their dinner with Elly and Gigi, one of the boys on the stoop says that Atlanta and Minnesota, the two teams facing off on "Monday Night Football," have "lost 17 straight games between them." Later, after Jack is caught watching the game during dinner, just before throwing him out Elly admonishes him that the two teams are "0-and-17 between them!" The former makes sense if the teams are both on losing streaks, but the latter does not if it refers to their combined record on the current season. As of 1985, when the film is set, the NFL schedule did not include a bye week; both teams would have played the same number of games at any point during the season. As such their combined record cannot have added up to an odd number.
(Incidentally, Atlanta and Minnesota did play each other in 1985, albeit not on "Monday Night Football" and not in November; the Falcons beat the Vikings 14-13 on Sunday, December 15, 1985, at Atlanta-Fulton County Stadium. The Falcons, who had started the season 0-6, entered the game with a 2-12 record, and the Vikings were 7-7, giving them a combined record of 9-19; Atlanta's win broke a three-game losing streak and Minnesota's two-game winning streak. The game footage seen in the film is likely from November 23, 1981, when the Falcons and Vikings met in Atlanta on "Monday Night Football"; the Falcons won, 31-30.)
(Incidentally, Atlanta and Minnesota did play each other in 1985, albeit not on "Monday Night Football" and not in November; the Falcons beat the Vikings 14-13 on Sunday, December 15, 1985, at Atlanta-Fulton County Stadium. The Falcons, who had started the season 0-6, entered the game with a 2-12 record, and the Vikings were 7-7, giving them a combined record of 9-19; Atlanta's win broke a three-game losing streak and Minnesota's two-game winning streak. The game footage seen in the film is likely from November 23, 1981, when the Falcons and Vikings met in Atlanta on "Monday Night Football"; the Falcons won, 31-30.)
Scoreboard late in the game has possession for Bakersfield (lit up shape of a ball next to their 26 points), when Taft has the ball.
When Jack catches the ball on the final play, the ref signals "touchdown" twice. Once when Jack catches the ball, and again when he actually crosses the goal line.
A few times during the movie when Reno yells at Jack, you can see Kurt Russell is saying "fuck" but his word is over-dubbed to the common fall-back words like "freak", "friggin", and "fool". Any use of the word "fuck" more than once would turn the film into an R-rated picture.