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.