Other mistake: In the opening scene, Ben is seen riding his bike over the Mass Ave Bridge from Boston towards Cambridge, at MIT. A few moments later, he is seen coming over another bridge (the John Weeks footbridge) from Boston into Cambridge, at Harvard. There would be no reason for him to ride into Cambridge over the Charles River at MIT and then seconds later be riding into Cambridge over the Charles River at Harvard.

21 (2008)
1 other mistake - chronological order
Directed by: Robert Luketic
Starring: Kevin Spacey, Kate Bosworth, Jim Sturgess, Aaron Yoo
Visible crew/equipment: In the very beginning of the movie, Ben is seen riding his bike over the bridge in an aerial shot. Near the top of the screen, if you look carefully at the end of the bridge you can see a police barricade at the end of the bridge. It is there because the bridge is closed for filming.
Kianna: Everybody knows to split eights. My grandmother splits eights.
Question: If the 21 game is still played in casinos, there could be hundreds of geniuses who can count and cheat the system as shown in the film. Is this a possibility, or have casinos adopted extra security measures or something?
Answer: Yes, most casinos have now upgraded to the automated card shufflers, which constantly shuffle the cards after each deal, so there is no way that counting cards would be possible.





Answer: Casinos have always looked out for people counting cards, even before the real events that inspired this movie.
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