How many movies have Jim Backus and Lloyd J. Schwartz collaborated on?

They have worked on 4 movies together! Their first movie together was Goodnight Jackie (1974) while their highest rated movie together was The Castaways on Gilligan's Island (1979). They have not worked together since The Harlem Globetrotters on Gilligan's Island (1981). They are most known for their comedy films together.