Continuity mistake: It is known that Dorothy married Stan because she was pregnant and they were married for 38 years. However Michael is not 38 - his age is stated as either 23 or 30 in different episodes, a mistake in itself - and in the 2 episodes her daughter is in, she doesn't look to be anywhere near 38 either.
Continuity mistake: In one episode, Rose talks about being valedictorian of her high school class in St. Olaf. In another episode, Rose goes to night school (where Dorothy is her teacher) in order to get her GED because she never graduated from high school. While talking to rose about the class Dorothy states the class is for people who didn't get a diploma. Additionally, in the episode "Whose face is this, anyway" Rose mentions that she was in a sorority called the "Alpha Yams"; when the girls look at her strangely, Rose states "It was an agricultural college." She could not have gone to college without a high school diploma.
Continuity mistake: In series 3 Dorothy's son Michael, who is engaged to a woman 21 years older than he, is supposed to be 23. In Series 2, when Michael sleeps with Rose's daughter, Dorothy mentions that he is 29 years old.
Continuity mistake: Angela says that she and Sophia are the only ones left living in the family, but in later episodes their brother Angelo shows up.
Continuity mistake: Throughout the show, Rose implies through numerous stories that everyone in St. Olaf, explicitly including close family members, is just as dumb and weird as Rose herself. However, most of Rose's relatives we meet are perfectly normal people, including her adoptive mother, both of her daughters that we get to see, her biological father and her blind sister. During a dream sequence, her adoptive father appears and he doesn't seem to be unintelligent either, giving her good advice. Only her cousin Sven fits her description by being arguably even dumber than her.
Continuity mistake: In the episode when Dorothy is trying out for Jeopardy, she is sitting on the couch studying, When Sophia sits down to talk to her Dorothy is looking at a page with just words, It cuts to Sophia and then to Dorothy and the page now has pictures on it. You can still see the corner of the book when the frame is on Sophia and you can see that Dorothy did not turn the page.
Continuity mistake: Whether Gladys Goldfine is alive or dead changes from episode to episode. For example in one episode, Sophia is mad at her because she doesn't take her out to a Tony Bennett concert and we see her apologizing to Sophia in the end, but in an earlier episode Salvatore's spirit told Sophia that Gladys has an affair with Charlemagne in heaven.
Continuity mistake: In the episode where Sophia loses her glasses, Dorothy answers the door and Sophia says "is this 6151 Richmond St?" In the episode where Dorothy has taken up smoking again and sets off the smoke alarm, Blanche and Rose rush into the kitchen, Blanche dials 9-1-1 and says "send a firetruck to 5161 Richmond, I'm on fire."
Continuity mistake: Blanche's attitude towards birthday parties changes throughout the show. Originally, she disliked them, but Rose changed her mind when she invited several men Blanche desired, as is seen in a flashback. In the same episode, the Golden Girls threw a surprise party for her which she was happy about. In a later episode, she hates birthday parties again (with Rose being baffled she doesn't like them), but is happy again at the end of the episode when Rose invites men to her party.
Continuity mistake: In the pilot, Blanche's bedroom is to the back left, not down the hall. From the series' second episode on, the lanai was out of the back left door and all the bedrooms are down the hallway.
Continuity mistake: In this episode, Blanche was talking about how she learned of her late husband, George's, death. She said she got the phone call late at night and the officer on the phone (chewing potato chips), told her that her husband was killed instantly in a accident. But in another episode, Sophia made a comment about how Blanche was getting a pedicure while her husband was dying in the hospital. Blanche admitted to this, so it was not one of Sophia's smart remarks.
Continuity mistake: Blanche says she can't go to the Sinatra concert because her final exam is that night. In the first classroom scene, the chalkboard says that the final exam is in four weeks. But before Blanche gets home and tells the girls that her teacher wants her to sleep with him, Dorothy says the concert is in two weeks. It is the same day, since Blanche is wearing the same outfit and she wouldn't wait two weeks to tell the girls about her teacher.
Job Hunting - S1-E22
Continuity mistake: In season 1 episode 12, the wallpaper and wall decorations are changed in the kitchen but in this episode they revert back to the original.
Suggested correction: That's because the episodes were aired out order than when they were produced. This episode was the second episode produced (production code "002") whereas episode 12 was the 14th episode produced.
Continuity mistake: When the women are sitting at the table outside, Lily insists on pouring everyone's lemonade. She is shown pouring the first 2 cups, then in the very next shot the remaining empty cups are gone from the tray and everyone has their cup of lemonade.
Continuity mistake: In this episode, Blanche goes out with Stan, which results in the two of them becoming good friends who see each other often and hang out together. The only reason they end their friendship is because Dorothy got jealous, not for personal differences between them. Although Dorothy assumed the two have an affair, it turns out they were really just platonic friends who liked going out together. Still, in every episode afterwards, Blanche dislikes Stan again and treats him like an annoying person just like before, even though in the meantime she figured out how much fun he can be as a friend.
Big Daddy's Little Lady - S2-E6
Continuity mistake: Dorothy takes a cheesecake out of the fridge and it's halfway gone. When she gets to the table, the cheesecake changes and has not had a piece cut out of it. When she sets it on the table, it is halfway gone again.
Continuity mistake: When the girls are sitting around the campfire, the amount of burned wood changes from shot to shot. First it's partially scorched, then mostly scorched then partially scorched again.
Continuity mistake: Napkins, plates, etc. disappear from the table as Blanche is talking to Dorothy. (00:03:15 - 00:03:55)
Continuity mistake: Towards the end, when Sofia's cake is done, she takes it out of the hot oven using potholders. Less than a minute later, when the men start to conga, you can see her discard the potholders and pick it up with her bare hands. It is a glass pan and still would have been much too hot to hold.
Empty Nests - S2-E26
Continuity mistake: When Dorothy snaps at Oliver, she mentions him "throwing up in the pool" at a new year's party at Blanche's house. There is no pool on the girls' property (which is Blanche's house, and they've always all lived there); it is never seen or mentioned outside of this episode.