Gabe Kaplan and John Travolta both left the show after the third season. Kaplan left after two episodes in the final season due to, creative differences with producer James Komack. Kaplan's name still in the credits but, he rarely appeared in the show. On the other hand, Travolta's original five year contract was altered after the massive success of Saturday Night Fever. Finally, Travolta appeared in eight of the 22 episodes, for $2,000 an episode and, he was billed as "Special Guest Star".