The Mandarin/Chinese song that Johnny Knoxville sings that can be seen in the trailer is actually Jackie Chan's song "Ming Ming Bai Bai Wo De Xin" (Please Understand My Heart). Back in Hong Kong, Jackie Chan sung this song to great acclaim.
Jackie Chan and Director Renny Harlin had scheduled filming a fight scene for the abandoned film "Nosebleed" on the roof of the World Trade Center the morning of the 9/11 attacks. Instead re-scheduling the shoot for the next day as Jackie Chan came up with new stunt and fight choreography ideas using a window washing lift.
Jackie Chan came up with the name "Bennie" for his character, so, at some point, his partner's daughter Samantha to called him "Uncle Bennie". This is an homage to Kim Chan, who played the character "Uncle Benny" in American movies including Lethal Weapon 4 (1998). He only changed the ending -y to -ie out of courtesy.
The entire journey that Bennie (Jackie Chan) and Connor (Johnny Knoxville) took (from Siberia, Russia to Zamiin-Uud, "China Border") is supposedly over two thousand kilometers (one thousand two hundred forty-two miles).