The Return of Optimus Prime (1) - S3-E29
Other mistake: When the Protectobots combine into Defensor, his right arm is missing.
Transformers (1984)
1 other mistake in season 3
Starring: Frank Welker, Corey Burton, Peter Cullen, Christopher Collins, Chris Latta
Genres: Action, Adventure, Animated, Family, Fantasy, Sci-fi, Thriller, War
Revealing mistake: When Bumblebee is knocked onto his side, Ratchet kneels down to shove him back onto his wheels. The only problem is that when Bumblebee drives away, the animators forgot to add Ratchet's leg (that was previously obscured) into the frame.
Rodimus Prime: Last big party of the summer, folks! Let's go out with a bang.
Ultra Magnus: Just once, couldn't your attitude reflect the gravity of the situation?
Rodimus Prime: Not if I can help it.
Question: What is the true origin of the Constructicons? "Heavy Metal War" claims they were built on Earth by Megatron, but "The Secret of Omega Supreme" shows them already on Cybertron before the war on Earth began. Is this a legitimate mistake or is there a reason behind it?
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Answer: This was actually one of many errors in Transformers, the Constructicons MUST have been built on Cybertron, the only transformers genuinely built on earth were the dinobots, reason being Vector Sigma has to give personalities to each and every robot, else they end up like the dinobots, very simple and dumb. For reference watch the episode "The Key to Vector Sigma" which introduces the Stunticons and Arielbots - both Megatron and Optimus Prime have to go to Vector Sigma to get decent personality traits installed, prior to this the new robots are controlled by remote controllers and have no AI.