Final appearance of Janet Jackson's recurring role as Charlene. Janet Jackson chose to leave the series to focus on her singing career.
In addition to focusing on her (eventually successful) music career, Janet Jackson had just a landed a role on "Fame" (1982), which was a deciding factor in her leaving the series.
Although Maggie and Sam joined the family two months prior to this episode, there's no mention of the characters in this episode. Given Kimberly's hair style, this episode was clearly filmed earlier in the season but not aired as planned.