Arnaz never forgot his lines
In addition to his acting prowess, Arnaz possessed a range of remarkable abilities. One such talent was his photographic memory. After just a single reading, he could effortlessly commit the majority of his lines and scenes to memory. Unlike most actors who dedicate hours to practicing their lines and perfecting their performance, Arnaz didn’t need extensive rehearsal time.
This was especially important for him since the show was performed live in front of an audience, leaving little room for error. Remarkably, Arnaz never faltered or forgot a single line during his performances.
William Frawley had trouble remembering his lines
While portraying the character of Fred in the sitcom, William faces difficulties in remembering his lines. Despite putting in a significant amount of time and effort into memorization, he often forgot his lines during rehearsals and even during some episodes, leading to great frustration.
In one instance, he expressed his anger by tearing pages from the script, making him perhaps the first actor to experience the rare combination of feeling overwhelmed by an abundance of lines while also struggling to recall them.