Factual error: In the opening game of the movie the announcers at the ball park are referring to the visiting team as the Peninsula White Sox. The team shown on the field is the Hagerstown Suns. (00:07:00)
Factual error: In the opening narration, Annie Savoy states, "...there are 108 beads in a Catholic rosary and there are 108 stitches in a baseball." While it's true that a baseball has 108 stitches, there are only 59 beads in a Catholic rosary.
Factual error: When Kevin Costner says that if the pitcher starts him out with a curve-ball he is taking him downtown, he strides to the plate and pounds a homer over the left field wall. However, the shot that shows the ball actually flying over the wall shows the distance at 410 feet. No minor league or even major league ball park is 410 to left field, indicating that the shot was actually taken in right center, no where near where Costner's ball actually went out.
Suggested correction: I have played at old minor league stadiums with much larger dimensions. One must check the schedule of the Durham Bulls and find dimensions prior to making this claim.
Factual error: As Annie is giving an update on how the Bulls had a great June and July, they showed highlights of the Bulls playing a team called the "Mustangs." No team in the Carolina League in 1987 (or 1988 when the movie was released) had that team nickname. She also mentioned "kicking the holy shit out of Greensboro in a three-game set." Greensboro didn't have a team in the Carolina League. They had a team in the South Atlantic League. Teams from different leagues don't play each other.