I just thought of another possible crossover. Chevy Chase as 'Fletch'. His character was similiar to Magnum, and the movie dates back to the 80's! Fletch would probably steal the Ferrari, and Magnum would have to relunctly bail him out after a phone call from Tanaka!
Golf I think Rick, TC, and Higgins would never let Magnum hear the end of it if there were a situation like that, and I do think that story line could make a very entertaining episode.