The makers wanted to use "London Calling" by The Clash, but couldn't afford the rights. Director Kevin Allen got hold of fellow Jack*, Martin Ace of "Man", to write "Destination London" instead. (*native of Swansea).
Agent Cody Banks (2003) director Harald Zwart quit after disagreeing with the studio over the amount of budget allocated to the film (only $1 million more than the first film). Zwart wanted to use a lot of CGI effects which would have brought the budget up to about $30 million, a figure that MGM deemed to be too high.
According to the DVD commentary, even though the opening camp scene was set near Seattle, Washington it was actually filmed in London. The underground facility beneath the camp was filmed at Canary Wharf Tube Station in London as well.