I noticed that the old topic for this awesome show was past the revival limit, so I thought I'd try to reboot discussion. Monday was the most recent episode, Northwest Mansion Mystery, and the next episode, Not What He Seems, will air on March 9.
So, let the discussion begin!
As for author theories,Spoiler
Also, the Teaser for "Not What He Seems" looks very promising. 8D
Source: Gravity Falls Topic
I made a Gravity Falls discussion topic in Completely Off Topic. Feel free to fuel the discussion over there if you're a fan of the awesome Disney show.