(at around 32 mins) Stunt No. 5 involved Phuchit eating a plate of feces, which in reality was a mix of durian, syrup and peanuts.
(at around 19 mins) Thailand's prime minister at the time, Thaksin Shinawatra, is directly referenced in the film--his photo is on the newspaper Phuchit uses to swat a fly.
The film covers one day but actually took about seven months to film.
A short film prequel, 12 Begin (2006), was made as part of the film's pre-release promotional campaign. It was shown in limited screenings at SF Cinema City theaters. A sequel called 14 Beyond (2009 was released in Thailand in 2009.