listening to Gravity Falls episode commentaries is great. Alex Hirsch nearly worked himself to death constantly. Grunkle Stan was nearly voiced by Matt Chapman of Homestar Runner. Literally nothing aside from the twist about Stan having a twin was planned more than a few episodes in advance. The zodiac wheel meant nothing and consisted of random symbols from the first 7 episodes because the intro was animated after those were done. Alex came up with the term “search for the blind eye” to be an extra bit for the between-season shorts before deciding to actually have a payoff for that setup and writing Society of the Blind Eye. Bill was meant to be a joke character and when Alex suggested that he be a real villain Michael Rianda responded “You, my friend, have lost the plot.” Bill getting one episode in the spotlight was basically chance and he only became the main villain of season 2 because he was so popular with the fans. The reveal of the portal at the end of season 1 was suggested by Mike without thinking it through and he left before the next season and the other writers were SO ANNOYED after that went through because they somehow had to keep that plot going for the 10 episodes it’d take to actually pay off. I am genuinely astonished that this show came together as well as it did at all.
By the way – this is a good time to let folks know that all of the DVD commentaries (including the “hidden” ones) are currently available in this YouTube playlist.
(They have been up on YT before, and removed. Highly recommend that folks download them off YT and save them, now that the DVD sets are out of print.)