There are quite a few extras on the DVD of The World's Fastest Indian, but none of them except the commentary involve Bruce Greenwood. Over Bruce's two scenes Roger Donaldson reminisces on his practical jokes. That transcript follows:

Roger Donaldson on Bruce Greenwood:

Now Bruce Greenwood - the guy with the flap on the back of his head - is another old friend of mine who agreed to step in and help me out here and get involved in the film....And a...Bruce was one of the stars of Thirteen Days - he played JFK in Thirteen Days....a great actor, a really great actor.

And a great mimic! There's a very funny sequence where he did a great impersonation of me. I remember he came to the set one day and somehow they'd given him an appropriate wig and I see this guy sort of walking through the set and I thought, 'that guy looks a hell of a lot like me!' and I realized it was Bruce pretending he's me.