Dean Martin wanted to be on TV but also wanted to be free to do movies and records; his contract required that he only show up to do his variety show one day per week (on Sundays). That's why he always seemed slightly out of step with the rest of the cast, who had rehearsed with Lee Hale standing in for Martin the day before. When Martin made a mistake he'd just laugh it off. The audience loved it.
While filming True Grit (1969), John Wayne was trying to keep his weight off with drugs - uppers for the day, downers to sleep at night. Occasionally, he got the pills mixed up, and this led to problems on a The Dean Martin Show (1965) taping in 1969. Instead of taking an upper before leaving for the filming, he took a downer - and was ready to crash by the time he arrived on the set. "I can't do our skit," Wayne reportedly told Dean Martin when it was time to perform. "I'm too doped up. Goddamn, I look half smashed!" Naturally, Martin didn't have a problem with that. "Hell, Duke, people think I do the show that way all the time!" The taping went on as scheduled.
Throughout the run, Dean Martin never knew who would come walking through the door at the beginning of each show. This was to make it a lot funnier.
Dean Martin's contract stipulated that he was only required to work on Sundays. This necessitated that blocking the camera setups and rehearsals be done on Saturdays. It also meant that guest stars rehearse with Lee Hale standing in for Martin. On Sundays, Martin would usually work less than four hours and leave the set before taping was wrapped.
Dean Martin and Greg Garrison owned the show. They made a deal in the 1980s to sell off part of the show's rights, and netted over $20 million.