Factual error: At the very end of the movie, right before Javier Bardem is in the car accident, there is a shot out the driver's side window, past his face. In one of the driveways he is passing, a new Subaru Forester sits parked. The film is set in 1980.
Revealing mistake: In the bedroom, when Cassandra asks about what Jane has been writing and Jane answers, "Just something I started in London", when Jane gets up and moves to the table, it is obvious that she is wearing a g-string under her nightgown.