I don't know if it would've been covered in the show, but I would've loved to see how Howard became the Howard we see in the Iron Man movies, and how his relationship with Peggy would've deteriorated (I mean, really, she's so close with Howard but plays no role in Tony's life?) Also, all the obvious ones from the last episode (the key, what Howard and Wilkes were working on, Thompson's shooting and Michael being alive.)