The Dancing Triforce in Episode 2. Yes, it appears out of nowhere after the King talks about Tingle, and then everyone's dryhumping/dancing/slicing each other. Afterwards, it's like nothing ever happened.
Zelda's face briefly turning into that of a zombie in Episode 3.
Ganon's robe falls off as he throws Majora's Mask into a wall.
"This is a ti-THIS IS A TIME..."
Growing the Beard: The first short was just a short demo meant to confuse Joe_Cracker into thinking his movie was actually being made by DiC. The latter two are clearly meant to lampoon the script.
Marty Stu: Definitely Eian. How else is he wearing a KFC/Taco Bell shirt in a land where there is clearly neither of those to be found? He's also an attempted Deadpan Snarker (his "jokes" are So Unfunny, It's Funny) and he bears the slightest resemblance to the author himself in the test animations. It's worse in the script, where more of his "jokes" are done and very unfitting to the tone the story's trying to have, and he's apparently Impa's brother.
Narm: A lot of the original script. Special mention goes to a line that was replicated in the videos: "I cased over the moon..."