The scenes where Danny is driving the fire truck were done with John Cena in the cab, but a second steering wheel was hidden in the cab where a stunt driver concealed off camera controlled the vehicle.
Towards the end of the movie, the stolen money is being wheeled through a hospital in a body bag, on a gurney, sopping wet. It is then loaded onto the awaiting helicopter. On the helicopter, there is a fight and the money is falling out of the helicopter, onto the swimming pool on the roof of the building, with the money perfectly dry, fluttering in the wind.
What are the differences between the Theatrical version and the Unrated version of the movie?
The latest movie of Wrestling superstar John Cena was released in a PG-13 version for its cinematical run. On DVD/Blu-ray one can also find the so-called Extreme Cut of this movie that's basically only an unrated version that features approx. 2 minutes of new material and isn't really extreme at all. A detailed comparison between both versions, the theatrical one and the Extreme Cut, with pictures can be found here.
What does the title mean?
The title 12 Rounds refers to 12 rounds of dangerous games that Detective Danny Fisher (John Cena) is forced to play in order to rescue his kidnapped girlfriend, Molly Porter (Ashley Scott).
A Note Regarding Spoilers
The following FAQ entries may contain spoilers. Only the biggest ones (if any) will be covered with spoiler tags. Spoiler tags have been used sparingly in order to make the page more readable.