Even if it wasn't intended & wasn't in the script, I don't see how this is a slip up. Slip ups are things that are inconsistent, impossible, etc. It is completely possible & plausible that a player could fall down while taking the field.
I think that this could still be part of the movie..because even though it is Rosie's character, May's (Madonna's)nick-name in the movie is 'all the way may' which could be part of it..but that'st just what i think!!?