When Elizabeth and Grandpa are sitting in bed looking at seeds the seed packets have a barcode on them.
At 36:00, Grandpa is seen reading the exact same issue of The Blue Ridge Chronicle that was seen four months before in The Fire Storm (1976), as evidenced by the headline "Hitler - A Fanatic's Rise to Power."
When Jason sings his song to Vanessa at the pond, as they first sit down on the log together, you can hear a helicopter in the background going over.
In the previous episode of the show Mary-Ellen had told Olivia, "Curt's never had a family before and he doesn't know what it means," but now Curt suddenly has a sister. Curt's sister, Vanessa, has a very pronounced Southern accent whereas Curt has no accent at all.