was it normal for this DM to discuss his or her inspirations with you?
I don't expect a DM to tell me every time he incorporates a character, artifact, etc etc from one source and uses it in his game. That's not what I'm suggesting. I'd prefer that he not even incorporate that content in the first place. Being inspired and using something similar is completely different than ripping something off and using that exact thing.
When I made the comment about being upfront about stealing content, I'm referring to when a DM wants to
recreate an
entire scenario. If you can't change things enough to make it more your own, then I will be disappointed if I realize I'm helping you recreate a scenario from a tv show. But if I was told, "I want to run an adventure that is pretty much the exact episode from Xena." then I would be more understanding (but probably still disappointed).
If I'm playing a FR campaign and I meet Drizzt, that's fine since Drizzt is part of the setting. But I don't want to play in a Dark Sun game and then meet Peter Pan because the DM thinks it's funny. And I don't want to play a Star Wars game and have a merchant give a crew member a Tribble from Star Trek that eats up our food and multiplies enough that the ship is infested with them until they start dying off from poisoned food stock. But if you called them Reptilaks and they were armadillo looking creatures that multiplied when exposed to a humans scent & loved eating electricity; that's less obvious of it being a ripoff even though I may still figure it out. At least I wouldn't feel so much like I'm recreating a scene from Star Trek for you.
I'll say it again since people seem to be ignoring a key point in my rant; I don't care if he uses a concept as inspiration for his own scenario, just don't use the exact same content. Change the names, tweak a little bit of something so it isn't noticeably an exact ripoff. That's all.
(I still maintain that any DM calling a wyrmling sidekick "Mushu" was not hiding anything.

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Oh, that could be the case. Like you said, just because I wasn't familiar with the character or movie doesn't mean he was trying to deceive me. My gripe isn't whether or not he was being deceiving. It makes it no more or less lame to me either way. I just thought it was cheesy that he in fact used the actual character in his game & it didn't seem as interesting of an experience anymore.