Most scenes set in Las Vegas were shot in Guerrilla style. The crew was unable to get the needed permissions for filming, so they discreetly shot the scenes without any warnings. Most of these scenes show the main character roaming the streets of Las Vegas.
The Bible verse "I am the Alpha and the Omega, the First and the Last, the Beginning and the End." which is often spoken throughout the movie is verse 22:13 from the Book of Revelation.