This episode marks the last time that the Regal Beagle is shown.
Sondra Currie who played Arlene the artist Jack becomes friends with on this episode, went on to appear in the three Hangover films along with Jeffrey Tambor who guest starred on several episodes of Three's Company and was Jeffrey P. Brooks III on the Three's Company spin off, The Ropers.
When Jack's picture is hanging above the bar in the Regal Beagle, you can tell it's only half of a drawing and not all full drawing of Jack.
Larry (Richard Kline) says There's a Crowd when Marilyn (Janice Heiden) wants to go out with Jack (John Ritter). Three's a Crowd is name of the spin-off of Three's Company with John Ritter, that began the following season.