The estate belonging to the dead woman Echo imprints is the same set (or possibly real building) that was used during the production of Gilmore Girls (2000), in which it was used as Rory's private school Chilton. Incidentally, Gregg Henry who plays the dead woman's brother used to play Mitchum Huntzberger on Gilmore Girls, the father of Rory's boyfriend Logan.
While showing Victor the horses, Jack wears tight tan pants and a maroon shirt. This is an outfit made famous by the character Captain Malcolm Reynolds in another Joss Whedon show, Firefly.