Casinos don’t like to back up cards because it may cause some players who won because of the mistake to lose. The general policy is that if there is a mistake more than one card back then the hand is ruled dead. However often casinos will bend the rules a bit to keep the players happy. For example, last month I was playing blackjack at the Venetian by myself, when I doubled down. The dealer never saw me make the double down bet, thinking I stood, turned over his cards, and hit is own hand with a 4. I then brought the mistake to the dealer’s attention. The pit boss gave me the choice of accepting the 4 as my double down card or it could be burned for the next card in the deck. I chose to burn it and the next card was another 4, and I ended up losing. Although I was happy with how it was handled the pit boss told the dealer to push my bet anyway, which I thought was very nice and beyond the call of duty. To get back to the issue, as long as the floor gave you back your full bet then I think that was procedural.