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.
Continuity mistake: Napkins, plates, etc. disappear from the table as Blanche is talking to Dorothy. (00:03:15 - 00:03:55)
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.
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: 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.
Answer: Ice makers were a new invention, advertisement purposes.