Just finished Hulu-ing the 2-parter. I thought the Bones half was basically okay, because it was interesting to get to see Ichabod and Abbie from the outside, as it were -- to see how they and their world look to people who don't know about the supernatural side of things. That lent an interesting perspective to it.
Although I don't like Brennan or Booth at all. They're both pretty annoyingly acted, especially Brennan, and kind of annoyingly written as well. And the rest of the characters just sort of blurred together as a bunch of lab rats.
Also, how the hell do you get facial reconstruction from a body without a skull? That's total nonsense. They should've come up with a better way of identifying the body as Howe's, say, by his ring or pocketwatch, or by evidence of injuries that matched those sustained by Howe in his military career.
I feel the Bones half would work better as a standalone than the Sleepy Hollow half. If you just watched the former, you'd probably just see Crane and Mills as a couple of eccentric guest stars creating a complication for the case -- although you might be puzzled by the references to the Washington Irving story. But the SH half only works as a continuation of what came before. If you skipped the Bones episode, you'd come in and see the SH episode starting with a recap of scenes you hadn't seen. That's not going to work so well on its own in future DVD or online releases.
As for the SH half, I was a little surprised they didn't make Zombie Howe a recurring antagonist, the new Horseman, as it were. This season's villains have been missing a personal connection with the heroes, or a connection to the Revolutionary-War backstory. Keeping Howe around would've remedied that.