While driving in New Jersey, the character Deacon Palmer is seen drinking from an "IN-N-OUT BURGER" cup. It is widely known that In-n-out burger locations are exclusive to the west coast of the United States and in fact does not have any locations in the east coast including New Jersey and New York.
When Doug is playing blackjack, he chastised the gentleman to his right for hitting when he should've stuck, thus "taking" Doug's card. The card was a face card, worth 10. After busting, Doug says he would've had 20 had the other player stuck, meaning Doug's two pocket cards add up to 10 before hitting. However, and this is huge, the first card Doug gets after hitting is clearly an ace. So Doug would've had 21. Instead he hits again, which isn't allowed.
Doug is playing blackjack in Atlantic City. The player is not allowed to handle the cards dealt to him in Atlantic City casinos.
Deacon was totally out of line chastising Doug that he had to lie to Kelly when he knew Doug had plans with Carrie. Doug would not have been in that situation, had Deacon not pressured him into going to Atlantic City. Deacon manipulated Doug them threw him under the bus, some friend.