Miles to Go - S6-E15
Continuity mistake: In this episode Rose's boyfriend Miles is revealed to be in the witness protection program and has not had any contact with people from his past including family. However, in season 5, episode 15 his daughter visited and didn't approve of Rose.
There Goes the Bride (1) - S6-E16
Continuity mistake: At the beginning of the episode, Rose says that Miles is in Europe with some students. The episode immediately before this one, however, revealed Miles being put back into a witness protection program, and leaving Rose.
Wham, Bam, Thank You, Mammy - S6-E5
Continuity mistake: When Mammy Watkins first hands the letters over to Blanche, the ribbons holding them together are knotted but the knot is on the bottom of the pile, and the strands are quite long. When Blanche reaches for them, the knot is on the top, it is now tied in a bow, and the strands are much shorter and neater.
There Goes the Bride (1) - S6-E16
Continuity mistake: As the show begins, an outside shot of the house shows that it is night. Then it cuts to the scene of Blanche and Sophia playing Chess in the kitchen - when Blanche is complaining about Sophia's "do-overs" you can see outside the kitchen window and it is daytime. After Rose walks in about 30 seconds later, you can see that it is night again.
If At Last You Do Succeed - S6-E3
Continuity mistake: In the scene where Stan stops by the house to have Dorothy help him tie the bow tie of his tuxedo, the undone tie is hung around his neck. After Dorothy finishes tying the bow tie and Stan proceeds to leave, she stops him to tell him to return in an hour. He excitedly turns around towards her, at which point we can see that the bow tie is now a clip-on. (00:18:55 - 00:20:55)
Other mistake: When Rose relates the story of her birth, she says that Ingrid died in childbirth, and her baby was left at the orphanage in a basket. Brother Martin didn't know of the child's existence until after she was adopted. So who put the baby in a basket, and why? If a woman died in childbirth at the hospital, with the baby's father unknown, the orphanage would have taken custody directly. Babies are abandoned in baskets by living parents.
Character mistake: Throughout much of the show, except for a few boyfriends Dorothy has had difficulties finding men to go out with her. Much of the show's humor is based around Dorothy looking unattractive and having no dates, and Sophia often desperately tried to arrange a rendezvous for her daughter. Nevertheless, in this episode, Sophia had no problem at all to find a whole bunch of men that are more than willing to go out with her, and according to the suggestive gestures Dorothy mentions, some of them apparently had a strong sexual interest in her after having seen her. They even offered their services to a cheaper price just to go out with her. Why is it so easy for Sophia to find that many men that eager to meet her daughter all of a sudden?
Other mistake: Rose says that she was "eventually" adopted by the Lindstroms. Rose has previously stated that she lived at the orphanage for eight years. While "eight years" could qualify as "eventually," Rose also says that the Lindstroms took the beef sticks that were left in the basket with her, and that the basket contained cheese and crackers, as well. None of those items have a shelf life of eight years.
Other mistake: Rose tells a story about her mother having undergone plastic surgery to look like Raymond Massey back when she still lived in St. Olaf. However, we see her mother in an earlier episode and she looked nothing like him.
Factual error: At the end of the episode Rebecca has her baby. When the doctor cuts the cord he hands her to Rebecca all clean and spotless. Babies have a lot of blood on them when they are born.
Answer: Ice makers were a new invention, advertisement purposes.