Other mistake: After the first race, in the scene where Lightning is rushing out on the stage thinking he is the winner, loads of confetti is shot out when the King and Chick Hicks gets onto the stage. The confetti is then falling down, but not a single flake hits any of the cars. However, in the following shots, you can see plenty of it on the stage underneath the cars, even though they haven't moved.
Other mistake: When Haskins and the other coach are going on their recruiting trips in the beginning, we can see the two of them talking on the phone. Funny thing is, that both of them are using pay phones. So who called who? How did they know the number? And how did they know when the other one was going to be near that pay phone? I feel it is highly impossible for one to reach the other when both of them are using pay phones.
Factual error: When asked how many seas the water from the Triton light is from, Huard says eight and is corrected with an answer of seven. The real number is 22.
Continuity mistake: When Yankee goes into his bedroom after losing the baseball game in the sandlot, he tears a hand-drawn picture of himself, Babe Ruth and his dad off the wall. The pieces of the picture fall on the bedroom floor. A few shots later the pieces are missing. Yankee was the only one in the room, and he didn't move them. Plus the window is closed, so it couldn't have been wind.
Continuity mistake: In the last game of the season, little used receiver 88 catches a long pass and runs/falls out of bounds, stopping the clock with 11 seconds left. The clock then starts before the snap of the ball (ball is actually snapped with 1 second left). A play out of bounds should stop the clock until the ball is snapped on the next play (in this way, they should have had time for a couple of plays).
Factual error: When the girls go to their motel rooms before the regionals, they exclaim over the color TV in the room. However, that TV has a digital tuner, not available in the mid-60s.