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.
Revealing mistake: It is obvious Dottie's bat did not make contact with the ball when she hit the home run, and the sound of a bat hitting a ball was a little off. This is true for many others at bat during the movie. (00:11:50)
Revealing mistake: When Jimmy is talking to Dottie by her car, shots facing Dottie show her standing near the rear of her car, but shots facing Jimmy place Dottie close to the driver's door. Dottie is close to Jimmy (near the front) when he leaves, but is next shown taking a few steps from the rear of the vehicle to reach the front (where she just was). (01:30:46 - 01:32:08)
Answer: An unnamed pitcher. I believe it was the character played by Janet Jones and listed as "Racine Pitcher"
Bishop73