Yes and there are 3 easter eggs you can find all I can say is.
You can find them in Castle, Spooky, Space station level.
They are not obvious but there are slight hints where you can find them.
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Okay, im having a hard time find them and I'm getting kind of desperate. I'll hunt the secret within the level itself, but can you ay least tell me which room specific Castle and Spooky level I should be searching in? (Like room 3 spooky or room 2 castle) I already found the one secret in the space station.