At the end of the first season, the ratings were low. CBS decided to cast Bob Denver's costar from Gilligan's Island (1964), Alan Hale Jr. to improve the ratings. It didn't work and the show was canceled after the second season.
In one of the episodes which included all three alumni of Gilligan's Island (1964), Bob Denver, Alan Hale Jr. and Jim Backus, there was an inside joke where Backus' character asked the other two: "Hey, haven't I seen you two before on an island somewhere?"
Bruce Glover was considered for the lead, the part went to Bob Denver, and he was offered a recurring role (every other episode.)