Continuity mistake: When Rodney steps on the escalator (a giant metal wheel with escalator steps), in the station of Robot City, you can see another robot standing on the step above him. In the next shot Rodney gets from the step on top of some sort of red pedestal. The robot on the step above him has now disappeared.

Robots (2005)
Plot summary
Directed by: Carlos Saldanha, Chris Wedge
Starring: Ewan McGregor, Robin Williams, Halle Berry, Paul Giamatti, Jennifer Coolidge, Mel Brooks, Amanda Bynes, Drew Carey, Paula Abdul, Terry Bradshaw, Lucille Bliss
A boy robot named Rodney is created. When he grows up, he wants to be someone great. He leaves his parents goodbye and goes to the robot city. There are bad guys there who do not care about justice. A lot of robots in the city are no good. Those robots are usually scrapped. Rodney teams up with some friends to fix the robots up and defeat the bad robots!
Steven
Fender: It's a mix between jazz and funk. I know! We can call it junk!
Trivia: 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.
Question: How did Rodney become magnetized after being kicked out of Bigweld industries?
Answer: He was stuck to a huge magnet that wheeled him out of Bigweld Industries and being made out of metal attracted a lot of metallic shavings and later metallic objects that followed him everywhere.
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Answer: Ferric metal can itself become magnetized after being exposed to a strong magnetic field (such as the one that stuck to him at Bigweld Industries. It will wear off after a short time.
LorgSkyegon