The series dropped out of the top 10 Nielsen ratings in its fifth season. This was the first time that a series starring Lucille Ball was not in the top 10. Because of this, Ball wanted to end the series and a final episode was filmed. But CBS convinced Ball to return for one more season.
The show came about because of a business transaction. In 1968, The Lucy Show (1962) had been running for 6 seasons, and the ratings remained solid. Lucille Ball sold the Desilu studio that year, however, so in order to retain ownership of her series, she ceased production on "The Lucy Show" and created "Here's Lucy". The new series had a slightly different plot and new character names (plus roles for Lucy's kids), but continued with the same cast and timeslot.
Originally Doris Singleton who played the recurring character of Caroline (originally Lillian) Appleby on I Love Lucy was supposed to costar on the series. Her character was supposed to be Harry's efficient morning secretary, opposed to Lucy, his scatterbrained afternoon secretary. Her character was dropped after the first episode, because it was decided to show more of Lucy's family life with the kids than her job.
Desi Arnaz Jr. decided to leave the show after the third season to pursue a movie career. However, after his departure, he makes one more appearance in the fifth season episode titled "Lucy and Joe Namath".
One of the strangest Lucy episode was when Lucy Carter meets her real life alter ego, Lucille Ball. This being the 70s they did a split screen, one side had Lucille Ball with her trademark red hair ( Lucy Carter), the other side had Lucy glammed up and wearing a black wig (Lucille Ball).