There were a few hundred people who were constant extras for many of the ballpark scenes - but sometimes more were brought in, for example at the Wedding scene, an evening of sitting around and waiting to be told when to cheer. (I was 8 years old and there)
They painted the ballpark green and yellow for the film - and called it El Toro stadium. No one could ever figure out why green and yellow, since these had never been the colors of the Bulls. Afterwards they painted back to the original blue and tan. The signs on the outfield (adverts) were left the same though, which provides a nice snapshot of what was going on in Durham of the 1980s.
Although the film was set during a long hot summer, it was actually shot in late fall/early winter. In several scenes, you can see the breath coming from the actors' mouths.
When movies are made, scenes are often
left on the cutting room floor.
Sometimes, there will be several versions
of a movie floating about on cable, tv or video etc. Other times, a Director may
release a special cut of the movie.