Anachronisms: The story takes place in the early Victorian Era (mid 1830's) but the costumes, recycled from Gone with the Wind (1939) according to Greer Garson, are from the US Civil War era with wide hoops and corseted bodices.
Continuity: When their cousin Collins is expected to dinner, the butler comes in to light the candles. The mother asks about Collins and when we cut back to the butler, all the candles are lit.