Visible crew/equipment: After the Peaches are introduced at their first game, they run onto the field. If you watch the background carefully, Rosie O'Donnell clearly trips over a production wire.
Continuity mistake: During the scene where Dottie and Jimmy are sitting beside each other at the front of the bus having a conversation, the camera cuts to Mae painting Kit's nails on the back seat of the bus. When the camera cuts back to Dottie and Jimmy, if you look at the back seat of the bus, Mae is sitting by herself and Kit is already about to sit back down in her seat in the middle of the bus. It doesn't seem likely that there would have been enough time for her to be in that position so quickly.
Continuity mistake: During the tryout/league formation sequence at Harvey (Wrigley) Field, every shot takes place at the famous stadium, except one. When Betty Spaghetti backpedals to catch a fly ball, the background shows a rickety wooden outfield fence, not Wrigley's famous ivy-covered walls.
Continuity mistake: A very early 1943 scene in Oregon shows baseball scout Jon Lovitz waiting in the club car of a train with a steam engine complete with smokestack. Geena Davis and Lori Petty run to catch the train for tryouts. But after they board in the next scene, the steam locomotive has disappeared and now a modern diesel engine is in front of the train heading east to Fort Collins, Colorado.
Other mistake: The older Dottie Hinson in the beginning of the movie has blue eyes and Geena Davis (young Dottie) has brown eyes.
Factual error: In the final game when Kit comes to bat, we get a quick glimpse of the right field foul line and there is an umpire standing on the line behind first base. In a previous shot, we see an umpire standing on the left field foul line behind third base. In the 1940s, three umpires were used for the majority of the games. With a runner on first base, as is the situation here, the umpire would position himself between first and second base. During the shots of Kit running the bases after she hit the ball, we see no other umpire between first and second base or anywhere near second base.
Continuity mistake: When the girls are relaxing at Suds Bucket, Ellen Sue is on the dance floor, then seated with her partner and back onto the floor again all within a matter of shots.
Continuity mistake: When Jimmy meets Dottie and Bob after the final game, we first see all three of them, with Jimmy and Bob shaking hands. While they are still shaking hands, the camera switches to Jimmy's head and upper body, and he is visibly not doing a handshake - instead within a second he is shown giving his hand again to Bob for a second handshake. Then, while he is still shown doing the second handshake, the camera switches to Dottie's and Bob's heads and upper bodies, with Bob visibly not doing a handshake. Finally the camera switches back to showing all three persons, with Jimmy just pulling back his hand from a handshake.
Continuity mistake: When Jimmy is shouting at the team members to get on the bus, we first see Evelyn and Doris in the background while they are descending the stairs of the hotel entrance and hurrying on the pathway towards the vehicle. Then the camera angle changes, and we now see them from a close distance descending the stairs again.
Continuity mistake: During the music clip, when Jimmy is finally starting to take over the managerial duties of the team, there is a scene where he is instructing Beverly before batting. We see the very same spectators sitting behind the Rockford bench, who were there in the other scene where Jimmy and Dottie were concurrently instructing Marla before batting - which happened several games before.
Continuity mistake: When the selected team members are announced, we see Mae and Doris hugging each other in rejoice. About one second later Kit is shown rushing through the crowd, and we now see Mae and Doris standing about two meters apart from each other, both facing towards the notice board, with a couple of other girls standing between them.
Revealing mistake: In the scene at the church, immediately after the girls were at the Suds Bucket, Mae is in the confessional when the priest drops his Bible. Mae steps out and kneels to pray as the priest opens the door to see who has just made their confessions. A closeup of the priest's face reveals that he has a "cowlick" (several locks of hair) hanging down in the middle of his forehead, but in the very next shot showing him in the background looking down at Mae, the lock of hair is suddenly gone.
Continuity mistake: Kit, still in her uniform, encounters Dottie on Dottie's way out of the Peaches locker room after the final game. After being sweaty and dirty during the game, somehow Kit's uniform is now spotless and her hair looks likes it's been washed and blow dried.
Continuity mistake: In the end credits where they are showing photographs of the girls, Rosie O'Donnell is wearing a Racine Belles uniform. Kit was the one who got traded to Racine, not Rosie.
Factual error: In the "training sequence" portion of the league formation, it shows the ladies being taught to pitch overhand. In actuality, the ladies in the league didn't pitch overhand until the later years.
Factual error: While Racine did win the title the first year of the league, their opponent in the championship was Kenosha, not Rockford. Also, the series went 5 games, not 7.