Jonathan Mostow: If you're referring to the chase with Bruce and Radha, here's a great irony — that sequence was one of the few not shot in Boston — in fact, it was shot almost entirely on the Paramount backlot (to my knowledge, it's the largest and most complex chase scene ever shot on their backlot — which, if you saw it, you'd realize how tiny an amount of
real estate it is — and so puling off a chase of that scope was quite a
tricky bit of
business).