So, I had to correct some things at IMDB. For instance, it only listed Penny Marshall as appearing in 19 episodes- it had not included "Myrna's Debut" from season three, or "The Pig Who Came to Dinner" and "The Exorcists" from season four. Not to mention "Two on the Aisle" from season five, that aired several episodes after "The Rain in Spain," when Myrna supposedly quit after getting married. (ah, The Odd Couple and those inconsistencies. hehe)

Also, Al Molinaro and Elino Donahue appeared in both of the aforementioned season four episodes, and I submitted those corrections, as well. Donahue and Molinaro also appeared on "The Odd Candidate." Probably some others missing some credits, too.

I'm continuing to see incomplete data. Episodes that all recurring characters appeared in, that are not reflected on IMDB.

As Felix may have said... IMDB, IMDB, IMDB... :)