The third film of director Shawn Levy to be released in the IMAX format. The other two are Night at the Museum and Night at the Museum: Battle of the Smithsonian.
Much of the robot boxing fights were motion-captured using professional boxers, supervised by Sugar Ray Leonard.
In an apparent nod to Rocky, the world champion robot is named "Zeus", while in 'Rocky', the champion is named "Apollo" Creed. In mythology, Apollo is the son of Zeus.
In an obvious nod to the iconic game "Rock'em, Sock'em, Robots", during the Atom/Zeus fight, Mashido assumes manual control of Zeus and grabs two simple joysticks and moves them back and forth operating Zeus exactly as done in the board game.
The film is based on "Steel" - a 1956 short story by I Am Legend author Richard Matheson. It was also made into an episode of The Twilight Zone called Steel.
The girls who ask to pose for a picture with Ambush are director 'Shawn Levy''s daughters.
As announced at the rodeo in the beginning of the movie, director Shawn Levy has confirmed that the film takes place in 2020. He stated in an interview: "The whole reason it's 2020 and not further in the future is because I knew this movie was going to be an underdog story and I didn't want the distant futurism of extreme sci-fi. I wanted the world to feel really familiar, so that the characters would feel really relatable. The cell-phone we used five or ten years ago looks different from today, but a diner still looks like a diner."
Each of the robots were built both in real life and CGI. For certain shots with animatronics, they were controlled by more than 20 puppeteers.
Midas' Mohawk hairstyle is a nod to "Clubber" Lang, Mr.T's character in Rocky III.
All video cameras used by the press are Red Epics, most with 3D lens attachments.
The opening scene at the fairground features a semi tractor with a cattle-hauling trailer which belongs to "Ron Smith Trucking", Breckenridge, MI.
Microsoft product placement: "Xbox 720" advertisement displayed in the fight stadium.
The Generation 1 robot boxer head seen in the junkyard is the head of a Rock'em Sock'em Robot game robot.
Charlie Kenton's idea to wear down Zeus's power supply by allowing him to repeatedly land blows on Atom was in fact a technique used by real life professional boxer Muhammad Ali. Nicknamed the 'rope-a-dope', Ali utilised the strategy to tire fellow boxer George Foreman, a much stronger opponent than himself and eventually gain victory. Ali famously angered Foreman with phrases such as "Is that all you got, George?" during the fight, mirrored in the film by Kenton's taunting hand gesture.