One was Harrison Ford (Indiana Jones). Just some actor who looked like him.was it in fact The other was William Katt (Greatest American Hero). Katt was supposed to have guested in an ep about a classmate (of Johnboy's) who was up for being expelled from Boatwright U for cheating. Richard Masur played the student on trial and Katt was supposed to be one of the judges. His character was in fact played by lookalike actor Dennis Redfield.