Besties
Larry Dallas, played by Richard Kline, was actually supposed to just make a one-time guest appearance. But the producers really enjoyed the natural chemistry between him and John Ritter that they then made him a regular cast member.
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Hint, Hint
At the end of the second ever episode, Jack deliberately says, “Goodnight John boy.” This served as a subtle nudge back when John Ritter starred on The Waltons as Reverend Fordwick.