And then we have Bev and Phil

Chekhov’s Boomerang: Marty’s radiation suit. Chekhov’s Gag: The joke about the TV show they’re seeing at the Baines’ house in 1955. It’s seen earlier at McFly’s house in 1985, and as Marty watches the same episode in 1955, he notes that he’s seen it and it’s a classic, to which one of his uncles replies