During the car chase Manu Bennett says, "This guy is like The Terminator." This is an obvious reference to Robert Patrick who played the T-1000 in Terminator 2: Judgment Day (1991). After the line is spoken, the audience sees Patrick's eyes look into the rear-view mirror in the car.
Opening footage of the enemy base in the Middle East is actually footage from Rambo III.
Cena trained with the Marines in preparation for his role in the film.
The movie was actually shot two years before it was released to theaters.