Continuity mistake: In the scene where Skeeter is on the phone with the lady who is interested in the book, she has an ashtray with a lit cigarette in it. In the next shot it is gone and the cigarette is in her hand, the next time it shows her the ashtray is back in its original position.
Factual error: Several scenes show cast members talking on telephones with modular cord plugs connecting the phone to the handsets. These modular plugs were not yet invented.
Factual error: There's a scene where one of the maids is vacuuming the bear in the house. At this point in the movie, it is around 1962-1963. President Kennedy hasn't been assassinated yet. Then the camera moves to a shot of the vacuum cleaner. It is an Electrolux Olympia canister made in 1978. I know, because I have two of them.