A part of me wonders if the mention of the fact that Crane needs to be a citizen to save the archive is leading to a green card marriage trope situation with Ichabod and Abbie. I don't know whether I would love or hate that. I guess it would depend on how they played it out and how quickly it happened. If it was…

They made sure to mention he was a british citizen in this episode so there's that. And I think it season one they somehow doctored some documents saying he was an oxford professor to explain his presence helping the police. But they never mentioned it again.