 In pre-production, the producers and the book's original writers predicted that the Vegas casinos would be unhelpful, as a film that told viewers the basics of card counting might hurt their bottom line.A featurette included with the DVD completely and accurately describes the "Hi-Lo" system used by the MIT Blackjack Club and by Rosa's team in the film.In fact, the writers were surprised when told by the producers that MGM Studios would finance the film, though all "MGM" casinos (including one used by the real MIT Blackjack Team) are owned by MGM Resorts International and are no longer related to MGM Studios.