There were 7 regular cast members of that deathless TV classic Gilligan’s Island; yet during the first season, the show’s catchy theme song only mentioned 5 by name. The Professor and Mary Ann were just lumped together as “the rest.”
When the show was renewed for a second season, Russell Johnson and Dawn Wells asked that their characters’ names be included in the song. At first, the network flatly refused, claiming re-recording the song would be too expensive. Then suddenly, they changed their minds and had the song revised.
The show’s star, Bob Denver, had gone to the network and said if the song wasn’t changed, he wanted his name removed from the opening credits. The network panicked and gave in.
The rest of the cast did not find out what Denver had done until 20 years after the show went off the air!