Sometimes Kent Stock wears uniform #40, then this changes to #37 and then back again within the same season.
During the scene that shows the game when the Norway team is not playing well, just before coach Stock chews them out for not playing heads up baseball, the game is being played on a bright sunny day. In one scene a player is shown slamming his bat to the ground in the dugout but in the background it is clear that the lights are on and it is dark outside and when the scene shifts back to the field, it is bright and sunny again.
In the first inning of the final game Kevin Stewart # 20 was batting 3rd after # 29 strike out. He came up to the plate. But # 30 Mitch Akers took the swings for him. In the 7th after #29 got hit by the pitch # 20 did bat and tied the game with a hit.
In the final game the announcer says Clay goes ahead in the top of the 3rd. After the inning, Clay's pitcher is upset at being being left on base. Stock says to the leadoff hitter the pitcher will hang one and the batter does hit a homerun. Later, the scoreboard shows Norway with a "0" in the 3rd inning.
In the championship game at the beginning of the movie the scoreboard shows Norway on bottom, meaning they are the home team and they would bat last. The scoreboard shows that Norway had scored 1 run in the 6th inning. But, they had not even been to bat in that inning. But the run is moved from the sixth inning to the seventh inning a few moments later so its simply a scoreboard operator error.
They did not use double-bases at 1st base in 1991. It showed an out being made with the first baseman tagging 1st after a great defensive play in the championship game.
The state championship games were held in Marshalltown, not Cedar Rapids. This was one of the fictionalized elements of the movie.
The movie shows that Van Scoyoc coaches briefly in the Detroit Tigers farm system. It clearly indicates Niagara Falls as a AAA club, when in fact it was a single-A farm team. Toledo was (and is) the AAA team for Detroit.
When ex-coach Van Scoyoc is being shown a newspaper report about the Norway team, the date of the article appears as Monday, June 27, 1991. In 1991, June 27 fell on a Thursday. May 27, 1991, fell on a Monday. Could this have been the intended date?
On minute 70:14 the umpire calls the strike above the zone that makes the catches reach up for it.
When Stock is proving his capacity with the home run challenge, the players are grouped 2/3 of the way down the 3rd base line. This is an extraordinarily dangerous location for them and they would not have stood there in reality.
Cardboard figures used to fill out the crowd at ball games are occasionally noticeable.
In minute 47:30 coach Kent is asking Mitch where did he learn to hit like that, as Mitch turns his head towards the coach, he answers without looking the ball and hits it.
Many of the logos in Veterans Memorial Stadium are for companies that did not exist in 1991 or had different logos then, such as U.S. Cellular.
Umpires are shown wearing the micro mesh pullover style shirt in the movie's recreated games, a uniform that did not exist in 1990-91. In one night game sequence, the umpires are wearing the navy blue micro mesh shirt, something that wouldn't have appeared on the high school field until the 2000s. In the actual footage that is used throughout the movies, the umpires are wearing the "proper" powder blue button-up that was worn in the early 90's.
Radio station KZIA did not exist in 1991.
Some of the equipment used in the film did not exist in 1990-91, such as the mesh style headband used on umpires and catchers masks in some scenes of the film.
The final game is supposed to take place in 1991 at Veterans Memorial Stadium in Cedar Rapids. However, that ballpark was torn down between the actual game and the filming of the movie. The stadium in the film in the current Veterans Memorial Stadium, which opened in 2002.
The sheriff that pulls Mitch over is from Madison County, but Norway is in Benton County.