When Kelly first greets his dad at work, Mr. Leak has a lunch box and thermos that he set on the trailer. A few minutes later, when his girlfriend drives up, he jumps right into the car without his items. You can still see them when they pan to Kelly.
A Toros player hits an obvious ground ball (considering the angle, the ball hits the ground just out of the camera's shot), but in the following shot, Tanner, playing shortstop, catches it as if it were a hard line drive.
After the Bears commit "the hidden ball trick," the Bears celebrate and the centerfield scoreboard says "Sometimes even your best friends won't tell you," and the leftfield scoreboard shows 4 1/2 innings, but it in an up close a few seconds later, it shows a "0" being put on the board.
When coach Leek is hitting balls to the Bears, Kelly is seen catching the ball when it is thrown back in and giving it back to coach Leek so he can hit it out again. The next scene shows a Bear throw the ball again but Kelly is standing with his glove on his hip, however coach Leek has the ball a second later.
The Bears claimed to be staying "downtown" at the Houston Hilton. Downtown Houston is about 7 miles from the Astrodome, they would not have been able to see the Astrodome from their hotel windows. The only hotel that would have offered the view shown would have been the Sheraton, now the Crown Plaza, which is across Kirby drive from the Astrodome/Reliant Stadium complex.
In the famous "hidden ball trick" scene against the Toros, the Bears pitcher is on the mound during the trick. This would make the play impossible because being on the mound "rubber" without the ball is considered a balk at any level of baseball.
The game was to be a sell out, or near sell-out. However, there appears to be a limited number of extras available. In several shots, the Astrodome is obviously empty except for the first few rows. Looking near the top of the screen, you can easily see the empty seats.
The goof item below may give away important plot points.
The Bears play the Toros because they are the California Champs. They had lost to the Yankees in the previous movie, which would have made the Yankees the California champs, not the Bears. The reason the Yankees could not compete is never explained.