Sam’s pictured in what looks like a remake of the "Summer Lovin'" scene on the bleachers, with the boys dancing around him in their letterman jackets. Plus, a complementary photo of the girls shows them in the counterpart Pink Ladies' scene, sitting at a cafeteria table. And the gal in the middle (presumably singing Sandy's part)? Mercedes (Amber Riley)!
Yup, it looks as if Samcedes is working out the kinks of their summer fling through song. Oh but... here’s a kink that can’t be sung away: Mercedes’s boyfriend. Good luck with that, Sam.
As for Darren and Dianna, either they had a very adorable ‘50s style swimsuit party for two or... they were filming the pool proposal scene from the very same episode. (Probably the latter though we’re wishing it was the former.)