In the episode "Lullaby in Frogland", when Wirt is looking at the angry crowd, there are two frogs resembling Luke and Professor Layton in the crowd
Now, to find someplace to wait out this rain.
Greg: As long as it's not that old, broken down...
Wirt: It's perfect! C'mon Greg!
Greg: Ahhh, Wirt...
The name of Greg's frog listed during the end credits changes each episode based on the running gag that Greg keeps renaming it.
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