Great episode. It's been so long that I forgot how amazing the animation was in this show. Of course, now it'll be another month or so before the next episode *shrug*.
I was surprised that they went into so much detail about the Stans's background. I admit, I was getting a bit bored during the high school years, especially when we were getting drama and little comedy, but it was all good besides that. Their parents were interesting, though surprisingly little was done with the mother. It was great seeing all of the Gravity Falls cameos, including the store owners that were killed by rap music. It was kind of odd how Dipper and Mabel's actual grandfather was almost an afterthought, but at least they acknowledged his existence. That said, I'm surprised we learned nothing at all about what Ford saw on the other side. But hey, he's sticking around, so I'm sure we'll learn more soon.
It was kind of cheap how the government guys were handled, but whatever.
The ending scene with Mabel was pretty sad. At least Soos trying to explain things to Wendy made for a nice lighter moment.