Changing the antagonists from Chinese to North Korean reportedly cost less than $1 million. They changed an opening sequence summarizing the backstory (Chinese "repossession" after the U.S. defaults on loans turned into a North Korean invasion), re-edited two scenes, and used digital technology to change Chinese symbols and dialogue to Korean.
To help get in shape for the role of a high school quarterback, Josh Peck spent time working out with and practicing with the Saddleback College football team in Orange County, California. Growing up with multiple health problems, Peck had never played football before and didn't know much about the sport in general, but wanted to implement real life quarterback tactics into the film.
The film features propaganda pamphlets, posters, and banners featuring People's Liberation Army symbols, such as the August 1 star. The posters attempt to garner support for a Chinese occupation, with slogans such as "Rebuilding Your Reputation", "Repairing Your Economy", and "Fighting Corporate Corruption".
Both Chris Hemsworth and Kenneth Choi have starred in movies in the Marvel Cinematic Universe. Chris Hemsworth as Thor and Kenneth Choi as Jim Mortia in Captain America:The First Avenger, Captain America:The Winter Soldier and in Spider-Man:Homecoming