Although oddly credited with playing Sylvia, Lucy friend and co-star Doris Singleton is called by the name Grace Munson in the show. Grace Munson is a character from "I Love Lucy" that appeared on camera twice but was often spoken about. Her first appearance was as a member of the Wednesday Afternoon Fine Arts League in 1953's "The Club Election" (S2;E19) where she is played by Lucille Ball's camera and lighting stand-in, Hazel Pierce. Coincidentally, in that same episode, Doris Singleton appears as Lillian (later Carolyn) Appleby. In season six, the Munsons have also moved to Connecticut and she and her husband Harry (Tristram Coffin) appear in "Country Club Dance" (S6;E25) where Grace is played by Ruth Brady. The guest star is Barbra Eden, who plays Grace's cousin, the sexy Diana Jordan. The Munsons also had a son, Billy, who was the same age as Little Ricky.
Per the title, Lucille Ball did a crossover from her show "Here's Lucy".
The title of this episode has been variously listed as "Lucy Visits" and "Lucy Carter, Houseguest," possibly to avoid the use of the word "lecher."
The same week this episode of "Make Room for Granddaddy" aired on ABC, CBS aired "Lucy and the Raffle" (S3;E19).
"Make Room for Granddaddy" was a sequel to Danny Thomas's phenomenally successful series, "Make Room for Daddy" which ran from 1953 to 1957 on ABC and from 1957 to 1964 on CBS. In March 1953, Danny Thomas chose ABC and Desilu Studios to film it using its three-camera method, perfected on "I Love Lucy," which ran concurrently on CBS. When "I Love Lucy" went off the air (in its half-hour format) in 1957, CBS moved "Make Room for Daddy" into its old time slot. The series was responsible for the creation of another long-running Desilu sitcom, "The Andy Griffith Show." In the seventh season, Danny Thomas is arrested by Sheriff Andy Taylor (Andy Griffith) and detained in the small town of Mayberry in an episode entitled "Danny Meets Andy Griffith." The episode aired on February 15, 1960 and "The Andy Griffith Show" premiered later that year on October 3.