Goofs

At the time depicted, Major-League baseball players almost never had jersey numbers higher than the 50s, yet several players have numbers in the 60s and 70s, a practice rare until the 1980s. High numbers on a Major-League uniform ordinarily indicated someone invited to spring training who had little chance of making the club--and if such a player did make the club (possible with the usually-dreadful Washington Senators), the player got a lower number.

Applegate "remembers" Jack the Ripper killing someone with his right hand. Research has shown him to be left-handed.

After the dance scene (The Mambo) with Bob Fosse and Gwen Verdon, as they walk offstage, Joe says "Good job, Bobby" almost inaudibly.

When Joe appears in his first game as a pinch-hitter, he hits a home run on an 0-1 pitch. As he rounds the bases, he is met at home by a few teammates. While shaking their hands, he clearly misses touching home plate.

When talking to Albert Linville's character Vernon, another actor makes the mistake of referring to Linville by his off-screen nickname of Linvy, rather than his character's name.

Actor William Adams, who plays the team's owner, mouths the lines of all the other actors in the courtroom scene near the end.

During Joe's tryout batting practice, he hits four over the fence. On his fifth attempt, he hits what is called another shot over the fence. However, when he's seen from behind the backstop taking this swing, a small cloud of dust is clearly visible to the left of Joe, near the edge of the infield grass, where the ball he hits actually bounces.

When Joe is introduced to the manager and the reporter at the ballpark, there is a palm tree in the background, although the scene takes place in Washington DC.

When Mr. Applegate and Joe meet for the first time, Applegate states he will be 22 years old, but if he was turned into a 22-year-old, but with Joe states he's been married to Meg since he was 20, Meg would've recognized him.

Lola says she is 172 years old, so she wouldn't be old enough to have seduced a knight in armor, as she sings in "A Little Brains, A Little Talent."

When Mr. Applegate sings of the (evil) "good old days", he mentions "Antoinette, dainty queen, with her quaint guillotine". The guillotine was an instrument of the French Revolutionaries, not Queen Marie Antoinette or King Louis XVI's government.