Trivia / Gravity Falls S2 E18 "Weirdmageddon"

• The Other Marty: After Louis C.K. admitted to sexual misconduct allegations, it didn't seem so funny for his character to force people to go into his mouth. So Alex Hirsch dubbed over CK's lines as the Horrifyingly Sweaty One-Armed Monstrosity.
• Throw It In!: Before it was dubbed over, the stuff said by the Horrifyingly Sweaty One-Armed Monstrosity was ad libbed by CK. CK actually did have to call his mother after his session was over.
• What Could Have Been: Originally, Bill had a full Villain Song^* written by Neil Cicierega which he sang as he unleashed Weirdmageddon, but it didn't make the cut. Here it is in fan-animatic form.

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