Not a mistake as such, but interesting to note. When Rodney and Fender are in Fender's room, lying in the hammocks, look behind Fender on the wall. Behind him is a "robot" version of the 'American Gothic' painting from the Rocky Horror Picture Show.

A little nod to another Blue Sky Studios Production, "Ice Age". When Rodney is looking around Robot city, he comes across a red robot that plays hip-hop. As Rodney walks away nervously ("Uh, n-n-never mind"), pause the frame just before the shot changes and you'll see (on the left) a yellow, mechanical Sid. Sid is the sloth (and the main character) from "Ice Age".

When Rodney is trying to repair Bigweld on the crosstown express, Bigweld sings a slowed down version of "Daisy, Daisy" just like Hal 3000 when he is being shut down at the end of 2001: A Space Odyssey.

The robot in the ticket booth when Rodney buys his ticket to leave Rivet Town picks his nose just after Herb says 'What instinct? He left a note. I'll be at the train station'

James Earl Jones has one line in the film, as a hardware-store voice simulator: "The Force is strong with this one." - A bit of advance publicity for another Twentieth Century-Fox release, also starring Ewen McGregor and featuring robots prominently.

When Rodney is working on superbot, some of his five year old parts can be seen on the bed behind him, to the left.

The green robot in the Bigweld Show (the one with the jet pack) was the original model for Rodney.

The piece with Rodney dancing on the chair near the start (because the Bigweld show was coming on) was based on a child of one of the production team doing a 'booty dance'