Film Cameo's - Robots

A robotic version of the Ice Age character 'Sid the Sloth' (the yellow robot mid frame) can be seen walking into shot behind the dancing Red Robot in Blue Sky's CG film Robots
James Earl Jones actually provided the voice of Darth Vader for the scene in which 'Diesel' fits a new voice box in the spare parts shop.

Also to be seen in the film is Wizard of Oz's 'Tin Man'