Corrected entry: Barring Joe Flood (Mr Dumpkin), Oscar James (the football coach), Mimi Wedell (Miss Mumsley) and Cullen Chambers (Charles) none of the other actors in Student Bodies (most notably the lead actress Kristen Ritter) acted in another film.
Bishop73
22nd Jan 2015
Correction: While a majority of the cast did not act in other films, 9 of the actors (not including the 4 you mentioned) did act in at least one other film afterwards. Additionally, 1 other actor was in a film prior and 1 other actor has been in a couple shorts since.
Bishop73