A shot of Steve Nebraska on the roof of Yankee Stadium is swapped left-for-right.
When Steve is talking to Al on the roof, he throws his glove to the ground. However, a couple of shots later he is holding it in his hand, even though he never picked it up.
Steve's green beer bottle keeps turning between cuts while he chats with the scout in the lounge.
Steve holds a pile of plates with one hand as he hurls them Frisbee-style out of Al's kitchen window with the other hand. In the next shot, he's holding just one plate.
When Ron is looking through the binoculars to see that Tommy Lacy is not in the dugout, his vantage point is from the outfield. When the shot shows Ron and Al in the box, it shows that they are behind home plate.
While it is unlikely the Cardinals would have batted Ozzie Smith 9th, it is not impossible. Smith batted 9th in every World Series game in an AL park in 1982, and batted 8th in the National League in 11 games in 1994. Had there been a DH in those games, Smith would have hit 9th. In his career, Smith hit 8th more than 1,700 times.
George Steinbrenner, the owner of the Yankees at the time, enforced strict personal grooming on his players and would have required that Nebraska cut his hair before suiting up for the World Series game.
Ozzie Smith is shown wearing a batting helmet with a protective ear flap. In real life, Ozzie Smith wore a flapless batting helmet.
In the film, pitcher Brendan Fraser bats in game 1 of the World Series. In the World Series, if the American League team is home they are allowed to select a designated hitter. Although teams almost always use this option, they are not required to do so and may allow the pitcher to hit.
In the final game scene, Ozzie Smith is at the bat with two outs and two strikes, but the scoreboard reads 0 strikes, 0 outs and #18 at bat. Ozzie Smith is #1.
A St. Louis Cardinals player is shown in the dugout wearing a hoop earring. Due to the risk of it getting caught or snagged, such jewelry is not allowed to be worn during a game.
During the tryouts, a wooden bat makes a sound like a metal bat.
Steve Nebraska is supposedly on the roof of Yankee Stadium, yet the Los Angeles skyline is visible behind him.