Garo bats in front of Kelly twice, getting hit by the pitch once, and making out once. Then in the final inning, he hits after Kelly, an unacceptable change in the batting order. There is a way this could have happened under Little League rules, but it would have required Garo to be removed from the game for a substitute and to then return to the game and replace someone else. That didn't happen.
While Bullock is talking into the microphone at the start of the game, the pop shield disappears between shots.
At the end when the kids are given the non-alcoholic beer, Tanner opens his and starts drinking it in the dugout, but as they walk out you can see Tanner open his bottle again.
In the middle of the championship game when Billy Bob yells at the team in the dugout his watch reads 10:48 when he starts yelling while at the end of the yelling it reads 11:45.
When Tanner is thrown into mud by the bullies, the mud on his face changes when he stands.
It is revealed that Buttermaker only pitched two-thirds of an inning in the majors, and left with a 36.00 ERA. This is statistically impossible, as a pitcher completing two-thirds of an inning must have an ERA that is a multiple of 13.50.
During the championship game, the Yankees hit a foul ball, but the game resumes as if it didn't happen.
In the game against the Giants, the umpires shouts strike two, but the Giants player walks away from the plate as if he's struck out.
No less than four times does Hooper roll his wheelchair to the left to exit the dugout. Given that there are steps this would make his exit a little tricky. However, on the third base end of the dugout in the championship game it is clear that Hooper rolls down a ramp.
In the 43rd minute after Roy tells-off Morris, the latter addresses him as Ray.
In the 43rd minute after Roy tells-off Morris, the latter wishes him a nice night, yet it's clearly afternoon.
After speaking Spanish to his teammate, one boy asks someone else "Do you speak Latin?" Again, it's Spanish.
When Roy Bullock first meets Buttermaker, Greg Kinnear (Bullock) flubs his lines. He says, "stop by and see me sometime, I'm over at Chevy Valley Subaru." The name of the car dealership, as referenced later in the film and as makes sense with standard naming convention, is Valley Chevy Subaru.