Cassandra hands the croupier a wad of cash to buy more chips. That's not how casinos work. You need to buy chips from the cashiers, and part of the reason for that is specifically to avoid having the croupier deal with actual money.
Cassandra uses her skills to determine where the roulette ball will end up and moves her chip to that position while the roulette wheel is spinning. This is not allowed in roulette.
The announcer says that Number Seven wins "by a nose", but in fact the horse is almost a full body length.
Fortuna and Bennie talk about burning witches in America, which is a common misconception. There were no women or men actually burned for witchcraft, they were hanged (the most common form of execution), stoned to death, pressed to death, or drowned.