The doors were so nicked from The Matrix, although needing the hats was a nice touch, and explained why at one point they stopped to pick up Richardson's hat.
The moment they mentioned not turning the door knobs anticlockwise, it was obvious that at some point he would do this!
I liked the bit when David shows Elise the doors, talk about instant culture shock.
Once the Adjustment Bureau had been explained, I half expected Harry to be a member of the Adjustment Bureau for the Adjustment Bureau (or something along those lines), and the actual ending was actually a bit of a damp squib in comparison to the slightly more exotic ways they could have gone.
Having him rush into the Ladies was obviously a nice twist to him originally meeting her in the Gents. Clearly deliberate, but nicely done nevertheless.