Redd Foxx and LaWanda Page had been friends since childhood, and she was his first and only choice to play Esther, Fred's sister-in-law. Producers wanted to fire Page due to her inexperience on-camera, but Foxx threatened to quit the show if Page was fired.
You fish-eyed heathen.
Both Fred and Lamont's birthdays change throughout the series. Sometimes Fred's birthday is in September and sometimes it's in December. Lamont's birthday is also mentioned as being in September and other times his birthday is either in January or February.
During the end credits of the episode "The Headache" (4.21), Fred and Lamont's voices can be heard. They're doing a soap opera cliffhanger parody. (Eg. Fred: "Will Lamont leave home?" Lamont: "Will you be quiet?")
On video and DVD releases of the episode, "Blood is Thicker Than Junk", about 3 minutes of footage is removed. They edit the scene of Lamont getting up and purposely breaking the interviewer's pencil before leaving. It then cuts to the scene of Fred trying to lift a heavy trunk then in comes the man Fred later hires. On all video and DVD releases, at the employment office right after the interviewer gives Lamont his new job, it cuts right to Fred and his new employee talking.