Corrected entry: When Jack is dealing 21, one of the players doubles down on an 11. Jack ends up getting blackjack, and takes both of the player's bets. However, when a dealer gets blackjack, a player only loses his original bet.
Corrected entry: Jack first meets Bella in the change room as she takes off her top in front of him. If there is a casino in the world that has unisex change rooms, I'd love to know about it.
Correction: The Barracuda casino in london's Baker St, does not have unisex changing rooms as such, but it is common for the guys to get ready in the girls room as the facilities are better and many of the girls think nothing of changing their tops or skirts while the blokes are there. the film never shows a clip of the sign on the changing room door, so it is only assumption that this is a unisex changing room.
Correction: Gaming laws across the world vary, and in some countries you do only lose your original stake; but Jack is working in a British casino, and the gaming laws in the U.K at the time of filming allow the dealer to take the original bet and the double.