From INTERNET MOVIE DATA BASE.
Under GOOFS, for the movie, MAJOR LEAGUE.
Factual errors: Near the end of the movie, Cerrano hits a home run, and then circles the bases while holding his bat. The rule is that if you touch first base and are still holding your bat, you are out.
The writer probably has a friend, who knows somebody, who umpires 9 year old LL. Or Low Level JV, somewhere...
See it yourself at:
http://www.imdb.com/title/tt0097815/goofs