All the main characters have prototypes. The prototype of the twins is the screenwriter Alex and his twin sister Ariel, the prototype of Soos is Alex’s college classmate, and the prototype of Grunkle Stan is Alex’s own Grandpa Stan.
Alex is not only a screenwriter, he also voiced Grunkle Stan, Soos, Bill Cipher, old man McGucket and the dwarves in the first episode.
The password at the end of each episode is written by Alex himself, and by listening to the last part of the OP, you can get a hint to crack the password.
Ariel (Alex's twin sister) had a colorful sweater when she was a child, and later became the inspiration for Mabel's colorful sweaters. The screenwriter also thinks that according to Mabel's noisy personality, she can't bear to wear the same clothes all the time like other cartoon characters. (Dipper: washing clothes is a waste of time, I'm a busy guy!)
Ariel wanted a pet pig when he was young, so Alex gave Mabel her beloved pig Waddles. The name comes from the pet pig of another creator when she was a child. Her family raises a pig named Waddles every year and roasts it. . .
Alex once asked David Lynch to voice Bill Cipher, but he refused. So Alex laughed and said that he had brought in a "bad impression" of Lynch when dubbing Bill. (So so nervous?)
Alex said that if he wants to invite guests to guest appearances, he will definitely invite Jon Stewart. Situ also praised Gravity Falls in his show.
Attach video address
http://www.bilibili.com/video/av2513332/
and a collection of OPs in various versions
http://www.bilibili.com/video/av1990411/
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