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Unexplained Changes in Cartoons:

Shaggy was a Vegetarian as his Voice Actor Casey Kasem was a Vegan. When Casey passed away and Shaggy was voiced by Matthew Lillard his Character started eating Meat products, but there was no in universe reason why he quit being a vegetarian.

In the Original Transformers G1 Episodes More than Meets the Eye, the G1 Autobots had the Ability to fly like Superman in their Robot Mode, this ability was randomly taken away with no in universe explanation, and the Autobots just stoped flying and made no mention of being able to fly in the past.

In Batman the Animated Series and throughout the DC Animated Universe, Batman characters go through multiple design changes and costume changes without any in universe explanation. As far as the story is concerned they are all interpreted to be the same design and character as if they never changed.

And lastly while this is an Anime and not a Cartoon: in Dragon Ball Super, Present and Future Trunks have different hair colors from purple to blue with no In-Universe Explanation. We have out of universe production reasons, but as far as the story is concerned there is no explanation. This is also different from Future Trunks in DBZ vs Super.