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.
The opening flashback sequence shows Jack clutching his injured right knee, but before the replayed game, it shows Reno injecting his scarred left knee.
In the final scene 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 and 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, 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. In 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.
The 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.
Two instances where the same shots are used for repeated scenes: During the first Taft football practice, Jack is seen missing passes because he's too busy practicing his end zone dance moves. The exact shot being reused is more noticeable in a later Taft practice when everyone now has their new football helmets but Jack is still wearing his knit cap and performing the exact same moves. During the game whenever the Taft players are in the huddle and Reno calls a pass or running play to Luther, the same shot of Luther looking angry at Reno is used each time.
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.