and Ford, Dipper and Mabel all leave Gravity Falls to go back. And Ford has to come up with an excuse for why they’re there with his long thought dead twin brother. And they all have to sort of take care of him and help him get his memories back and it’s slow and it’s hard and it hurts but when they see that spark of remembrance in his eyes, when he remembers even something small it’s worth it. And some nights are harder, a lot of the memories aren’t good ones. Those 10 years are the hardest P2
on him. Living out of his care, being chased out of towns. Not knowing if the next pay check would be the last. And the jails, those are hard. Worst of all Stan is the only one that lived those. They can’t help him with these, and finally Ford gets to see the affects of his choice firsthand, and on a vulnerable Stanley, an near pure innocent blank slate. And it’s like a slap with a bag of bricks. and just ugh I love they happy ending but I also just love to suffer. Like just fuck me up. (end)
I know what you mean, anon. It’s a bittersweet topic, memory loss, especially for someone like Stan who’s already given so much of himself. And I would have loved to see the whole tender process of drawing those memories out, both good and bad, but with his family being there for him, helping him recover, etc.
But I mean, it just wasn’t going to happen, simply in the essence of time the finale had to work with. Buuuut many people, myself included, are already exploring this topic more in-depth with fanworks, and I’m excited, that’s going to be my fix 🙂
I think he regained it so fast partially because of ingrained habits (such as yelling at Waddles), as well as…

(This gif is perfect lol.)
But it also seemed from the whole news report thing that it did take a few days for him to regain it.
Also, another theory I read somewhere on tumblr, the memory gun was set to erase Stanley Pines. But Stanley spent 30 years of his life, and most of that summer, being ‘Stanford’. So, that detail could have helped him regain at least that chunk of his memory back, his memory of being ‘Stanford’, which could have unlocked the rest.
And as McGucket has demonstrated, you only need to regain certain pieces in order to begin piecing together the rest of the memories.