I just thought about this after learning that Norman Fell once guest starred (https://www.reddit.com/r/threescompany/comments/1umr52n/john_ritter_and_norman_fell_worked_together_again/) as a ventriloquist in a 1989 episode of John Ritter's TV series, Hooperman.

Norman Fell was previously on the same episode (https://www.imdb.com/title/tt0653481/) of Murder, She Wrote as was Priscilla Barnes. Of course, Priscilla never actually interacted with Norman nor Audra Lindley on Three's Company. Priscilla and Norman didn't even interact with one another in this particular episode (https://bandsaboutmovies.com/2025/08/24/murder-she-wrote-s2-e8-dead-heat-1985/) of Murder, She Wrote.

Don Knotts made a guest appearance on Suzanne Somers' show, Step by Step in a Christmas (https://www.facebook.com/groups/6458169927578463/posts/9208360485892713/) centric episode (https://www.imdb.com/title/tt0709957/) in 1993. Don later made a cameo (https://www.reddit.com/r/threescompany/comments/1gdumpr/john_ritter_don_knotts_on_8_simple_rules/) on John Ritter's final TV series, 8 Simple Rules for Dating My Teenage Daughter (https://www.imdb.com/title/tt0503801/).

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Don Knotts was on She's the Sheriff with Suzanne Somers.

Norman Fell was on The Jenny McCarthy show with Suzanne Somers.

Richard Kline and Jenilee Harrrison were on That 70's Show together.

Richard Kline was on Step by Step but didn't share a scene with Suzanne Somers.

I always hoped John Ritter and Richard Kline would work together again. They had amazing chemistry. Richard said he was offered 10 out of the first 13 episodes of Three's a Crowd, but he turned it down to do a pilot with Shelly Fabares. Three's a Crowd would have been much funnier had he accepted that offer.

Ritter and Fell teamed up on same Dan August episode in 1970 "Quadrangle for Death” in Ritter’s TV acting. They were in the same scene at least once as I recall.