The bridge Vivian actually tried to jump out of was the Roosevelt Island Bridge, which is very close to the 59th Street Bridge. In fact, Vivian is facing the 59th Street Bridge, when she jumps.
When Jordan Is removing the red door, he starts unscrewing the hinges from the hall side of the door while the door is closed. There are no exposed screws on that side of a hotel door, otherwise anybody could remove your door.
The bridge shown was not the GW (George Washington) bridge, but the 59th or Ed Koch bridge.
Kay said the medium was killed by a double tap in her back, but we saw the hitman shooting 3 times at almost close range. According the fact they never said one bullet missed the target (as they didn't found a bullet in a wall), one can tell that the hitman never missed his target.