The company name "Cyrez" was originally "Cyrex", but the real-life company Cyrix complained. The movie had been shot, but all dialogue was dubbed and company logos were digitally altered during postproduction.
Director Chuck Russell and producer Arnold Kopelson had a rocky relationship during the entire production. The only reason the film was able to go forward and ultimately be completed (albeit way over schedule and budget) was that Arnold Schwarzenegger got along with each man separately and was able to negotiate schedules and logistics at a point where the two men refused to speak to each other.
John Kruger using two EM rail guns as weapons in the Baltimore Docks battle mirrors a Terminator using two Endo Rifles in the opening future battle sequence in Arnold Schwarzenegger's earlier film "Terminator 2: Judgement Day", which Schwarzenegger starred as The Terminator.
When John Kruger (Schwarzenegger) shows up at Dr. Lee Cullen's (Williams) house with the balloons, the back of his shirt says "Let's Party". Let's Party was a tagline to Schwarzenegger's 1985 film Commando.
The shot outside of the gay bar in DC showing the US Capitol Building was actually taken outside of the Phoenix Park Hotel on North Capitol St. in DC. The front of the hotel was covered in purple and the "AC/DC" fictitious bar name prominently displayed.
Cinematographer Adam Greenberg was personally chosen for the job by Schwarzenegger, who had worked with him on both Terminators. Schwarzenegger assured the production that if they wanted an experienced, professional cameraman who could capture the action on the film's hectic schedule, that Greenberg was the man for the job.
Although only Tony Puryear and Walon Green are credited with the film's screenplay - and the two of them along with Michael S. Chernuchin for the film's story - the film went through so many revisions from so many different writers that the final shooting script reportedly "looked like a rainbow". Frank Darabont and William Wisher Jr. reportedly did multiple rewrites during the production as well.
Arnold Schwarzenegger and James Caan have both starred in films about violent futuristic game shows in totalitarian societies. Cann in "Rollerball" as Jonathan E. and Arnold Schwarzenegger in "The Running Man" as Ben Richards.
Arnold Schwarzenegger's 3rd film which he plays a bodyguard. In "Kindergarten Cop" Schwarzenegger plays a tough Los Angeles cop whom goes undercover as a school teacher, so he can protect a woman and her son from a drug dealer and in "Terminator 2: Judgment Day" Schwarzenegger starred as a cyborg warrior from a post-apocalyptic future whom travels back through time to protect a 10 year old boy whom in that post-apocalyptic future is a rebel leader.
Alan Silvestri's score in this is similar to his score is Judge Dredd a year ago. Coincidently Arnold Schwarzenegger was considered for the role of Judge Joseph Dredd before his good friend and "Expendables" and "Escape Plan" costar Sylvester Stallone got the part.
"He will erase your past to protect your future" is the film's tagline. In Schwarzenegger played two robots from a post-apocalyptic future, one as an assassin sent to back to kill a woman, which will change the future and the other sent back to protect the woman's son and prevent the post-apocalyptic future from happening. Those films were "The Terminator" and "Terminator 2: Judgement Day".
Nick Chinlund portrays WitSec Agt. Calderone, and while on the agency's jet refers to transporting dangerous felons as being "a chauffeur for degenerates". Chinlund later portrays one such degenerate, Billy Bedlam, in 1997's Con Air.