In basketball stats, PF means "Personal Foul". PF also means "Power Forward", a position on a basketball team. If you are looking at NBA standings, PF means "Points For", or how many points a team is averaging, and PA means "Points Against", or how many points they are allowing.
Yes. Johnson attended USC on a baseball and basketball scholarship. He quit basketball after his sophomore year to concentrate on baseball. I have not been able to find any statistics concerning his basketball days.