Crew or equipment visible
During the storm when Minny is still employed by HIlly (30:50), Hilly is lighting a 3 candle crystal candelabra which is in front but to the left of her on the table. She puts the match to the 3rd candle (left candle to viewers) which is already lit. When Minny looks out the window at the storm & turns back there is no candelabra. There are only 2 single candles in individual crystal holders. No candelabra is seen.
Incorrectly regarded as goofs
At the fund raiser, Celia rips some of Miss Hilly's dress off. Later when Miss Hilly is outside with her mother, it appears to be fixed again. However, upon closer inspection, the sleeve is clearly pushed up against the rest of the dress to make the damage less conspicuous - a gap can be seen where her skin is showing through.