There is an anachronism: The $1 bills depicted are Federal Reserve Notes, which weren't put into circulation until 1963. Furthermore, it appears that the director was aware that in 1957, the phrase "In God We Trust" had not yet become standard on the reverse side of all U.S. currency, because most (if not all) the bills shown are face up. I consider it unrealistic that a bunch of gamblers around a craps table would all have their money face up when thrown onto the table. It appears that those bills are contemporary (i.e., from the era when the film was made), and therefor would have had the phrase on the reverse. The director was apparently not aware that the $1 bills in circulation at that time were nearly all silver certificates.