Heheh, actually there were
much better close-up shots of us when Gary Sinise walks between through the police line into the crime scene at about 6:45 in the episode. You can see us both clear as day. You can also see Re and I walking onto the street in one o' the top-down shots of the actual zombie walk right around 6:27 into the episode. There's another brief shot around 12:23. Not sure about any other parts of the episode as I haven't seen it all yet.
Anywho, here's a link to the full episode (better quality than what you'll see on Youtube):
http://alpha.cbs.com/primetime/csi_ny/recaps/ep406/