When Damon comes out of the bathroom and starts getting ready for the bachelor auction, he's not wearing his lapis lazuli ring.
A Bachelor is a man who has never been married. Here they have a Bachelor raffle and yet the character Alaric Saltzman takes part, but he has been married in the past.
When Kelly Donovan walks in on Matt and Caroline, she says "Not on my couch" but her lips don't move.