Factual error: When Jack arrives at a roulette table to replace Matt as the dealer, the roulette wheel is stationary. In UK casinos, it is never allowed to stop spinning at any point while the table is open.
Character mistake: Jack accuses Marion of being a mug punter because she bets on the lottery, despite the odds of winning of "14.5 million to 1." The odds of winning the lottery are in fact 13,992,000 to 1 - not much better, but at least a precise figure.