Continuity mistake: Buster parks his car outside Annie's house and is then shot inside her home. Then in a following wideshot of Annie's house, the car has vanished...
Revealing mistake: When Paul and Annie are getting ready to tap glasses, you can see Annie deliberately knocks over the candle. She moves her hand right into the candle to make it fall over.
Suggested correction: It is implied, though by no means certain, that Annie may have intentionally caused the glass of wine to spill, especially as at this point she already knows Paul has been out due to the direction of the Penguin figurine.
I've seen the movie several times, and Annie's knocking over the candle never looked on purpose. What you saw was an actress trying to make the action look real and not totally succeeding. Making an accident look real is hard, even for a great actress like Kathy Bates.
