does anyone know if this ends up being the last appearance of the evan's cottage?
That's a claim that KLS makes in one of her books, but oops, it's not the case. Maggie returns to the cottage during the Leviathans story to get it ready for new tenants, which sets up a visit from [spoiler]Paul, who didn't know Sam had passed away.[/spoiler]
The scene is immortalized on the blooper DVD.
And of course it's used again as Tate's studio.
But she's right that the Collinsport diner set isn't seen after she's hired to work at Collinwood, though it was actually much sooner than that.