Continuity mistake: In this episode Rose says her cat Fluffy died (as a lie) and Dorothy says "Rose, you've never had a cat, you're allergic." When Blanche and Rose first meet she is holding a cat named Mr. Peepers, and looking for a place she and the cat can live. Another episode she says she had a cat named Lindstrom Lindstrom.
Character mistake: When all of the ladies are sharing Sophia's bed because there's been a cold snap and she has an electric blanket, Blanche mentions that her bed has never been so cold on a Saturday night. A few minutes later, Dorothy - upset that the other ladies are keeping her awake - states that she has to get up for work "very early in the morning." Dorothy is a substitute teacher, and would not have to be up for work early on a Sunday morning.
Plot hole: At the end of this episode, the lady who was on the TV show with Blanche and Dorothy as "partners", shows up to ask Dorothy out because her and Blanche broke up. She says "I heard about you and Blanche". How could she have heard it? They just did it at the house.
Other mistake: In the 1954 flashback scene, it is Dorothy's 10-year anniversary, so she got married in 1944. In another episode, Dorothy said Stan impregnated her in the back seat of a car by saying he's going to the Korean War, which began in 1950. Also, viewers know that Dorothy went to college. A pregnant newlywed in 1944 with a husband off to war would not have gone to college but stayed home awaiting the birth of her child. And in 1945, after the war, she would have been a housewife, not a college student.
Character mistake: In her first appearance, Kirsten liked Dorothy, Sophia and Blanche and said that after her visit she now understands why Rose loves living with them. In her second appearance, she heavily dislikes the three women and states that she never understood why Rose preferred living with them over moving in with her.