Season 2 of Dexter's Lab suffers from the Butt Dial effect, every episode before "Photo Finish" has more balanced colors and more fluent animation:
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Episodes in the part of season 2 that's closer to Ego Trip have a reddish tint and more streamlined designs and movement:
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Dexter's hair is also red in this half of the season instead of orange. This isn't a color pallet choice, this is a mastering issue, as the animation cels for those episode don't look like that, although Dexter's darker hair color is still present on the cels:
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