電影中的賭場橋段大多取景於真實的Las Vegas賭場，不難看出賭場有多愛這部電影的
宣傳效果，以及現實中算牌的難度有多高。對於極少數可靠算牌賺錢的人，賭場仍可使出
趕人出場的大絕招。

決勝21點IMDB FAQ:

How did the casinos react to the book and upcoming movie?

This seems to be a question many people ask. People seem to think the casinos
are not thrilled with the movie and book. The opposite couldn't be more true:
the casinos love it! So much so they allowed the 21 producers to film scenes for
the movie in several Vegas casinos. It takes a big bank roll, much patience and
most importantly great skill to count cards and even then you may not make a
profit. The everyday person reading the book or seeing this movie who tries
counting cards in a casino will lose over 95% of the time. The casinos welcome
players like that and worst case for them, if you start to win too much money
they can kick you out.