The Mary Tyler Moore Show premiered 48 years ago tonight on September 19, 1970. One of the best opening theme songs ever.
The show was originally going to be about a divorced woman. Divorce was still a controversial subject in 1970, so it changed to a broken engagement.
Mary Tyler Moore has said that she wanted to do the series for another couple seasons but the writers and James L Brooks wanted to end the show when it did.
The kitten that meows at the end of the closing credits is a parody of the roaring lion that appears at the beginning of MGM films.
The meowing kitten in the MTM logo was actually yawning in real life during filming. As the cameraman couldn't get a usable shot of the cat meowing, footage of it yawning was used and a meow dubbed in.
Robbie Rist, who played the infamous cousin Oliver on The Brady Bunch, also played Ted's adoptive son on M.T.M.
Jack Cassidy was offered the role of Ted Baxter. He turned it down because he didn't want to be in the supporting cast of a female-led show. Cassidy later guest starred as Ted's brother.
The lyrics to the theme song were rewritten after the first season. The first season's theme song emphasized Mary's challenge of being independent, such as with the line, "You might just make it after all." However, with the series showing that Mary has become obviously successful in her own life, the lyrics reflected that change of tone such as with the line, "You're going to make it after all."
Moore wore a wig for the first season of the show, to make her look less like Laura Petrie, her character on The Dick Van Dyke Show (1961). When the wig was discarded, the change in her hairstyle, including her much lighter hair color, was never commented on in the show itself.