Continuity mistake: In the first two seasons, there are 3 bedrooms upstairs: Mama's, Fran's, and Sonja's. But after Buzz and Sonja move out and Aunt Fran dies, Bubba moves in and takes Aunt Fran's room. Vinton and Naomi are still in the basement complaining that they wanted Fran's room. However, originally there was another room upstairs, Sonja's room, that disappeared.
Plot hole: It is well known that Vint had two kids in the opening of Mama's Family, but later on, Vint and Naomi try to conceive and are having trouble. They all assume that it is Vint, but he already has two kids and this was never mentioned during the time they were trying.