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.
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.
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 3rd robot he works on (5th 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 & there's a background buzz.
In the opening scene as Rodney walks in Rivet Town, one of the vendors sells ice cream called "Auntie Freeze". (This is reference to Anti-Freeze, a chemical used in radiators in vehicles in countries which experience low temperature or snowy weather).
Rodney Copperbottom's design is inspired by an old Evinrude outboard motor in director 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 TV show.
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. Screen shots of the test appear as pictures hanging in Aunt Fanny's house.