Chris Wedge reports on the DVD commentary, that Robin Williams performed the scene with Fender and Rodney attempting to get past Tim eight times in eight different accents, including as a Polish valet.
The filmmakers wanted the music score to sound like it was recorded by the "Robot Philharmonic". To that effect, they hired performance artists Blue Man Group, known for performing on musical instruments made from industrial piping and other found objects, to do special percussion effects.
Rodney Copperbottom's (Ewan McGregor's) design is inspired by an old Evinrude outboard engine in Chris Wedge's garage, as well as on a Volkswagen van. An early version of Rodney makes a cameo, as the green robot with the jet pack, waiting in line during Bigweld's television show.
Originally, Rodney's co-passenger in the crosstown express sequence, was an old lady knitting calmly. For some long shots, the old lady is simply colored red, rather than replaced with Fender (Robin Williams). This version of the scene was the one used in movie clips featured in the film's video game.
Jack Hammer, the hardware store owner, is based on a character from a test short made early in development to test the look the filmmakers wanted. He was a director working on a scene with an actress. Screenshots of the test appear as pictures hanging in Aunt Fanny's house.
At one point, a voicebox with a recording of Darth Vader's voice is found. Ewan McGregor, the voice of Rodney Copperbottom, played a younger Obi-wan Kenobi in the Star Wars prequels, the third of which being released in 2005, the same year as this film.
At the start of the scene where Rodney is at the Rivet Town train station, the "ticket taker robot" can be seen picking his nose and examining his finger behind the booth window. On the commentary of the DVD, one of the commentators states this as being an Easter Egg.
In the opening scene as Rodney walks in Rivet Town, one of the vendors sells ice cream called "Auntie Freeze". (This is a reference to radiator coolant/anti-freeze, a chemical used in radiators in vehicles in countries which experience low temperature or snowy weather).
When Fender and Rodney arrive at the ball to try and get past Tim, we get a glimpse of the guest list. The names featured on the list are Mr. Vandersmelt, Forge, Silvia Goldbot, Cappy, Mme Goldie Van Bot, Ann Droid, and Mr. Silverleaf.
When Rodney first starts fixing the outmodes (after "Who wants to get fixed?"), the third robot, on which he works (fifth in the overall fixit sequence) is a reference to the children's game "Operation". Just as in the game, when Rodney is taking a wrench out of the character's left leg, he touches the tool to the rim of the hole. When he does, the "patient" robot's nose lights up and there's a background buzz.
In the chase sequence, while Big Weld is rebooting, he briefly sings the song "Bicycle Built For Two". This was the first song ever voiced by a computer, when in 1961, IBM programmed their 704 computer to sing it, to demonstrate their voice synthesis system. This is also the song sung in 2001: A Space Odyssey (1968), that Hal sings, while Dave deactivates him.
In Australia, a contest was held to Australian children to win a voice-over role in the movie. The lucky winners were chosen to voice the watches that one of the robots was selling in the train station.
This is one of the first major motion pictures to use the sound of a west African udu drum in the soundtrack. Composer John Powell used this traditional clay drum to create the tabla-like "whoop" sound heard in various music cues and themes throughout the picture.