Ted from bigscreenlittlescreen sent me a link to his Battle in Seattle on-set snaps. The one you see here features Andre 3000 and Michelle Rodriguez, but pretty much only like a page in a Where's Waldo book features Waldo.
He's called Wally in the UK, don't you know. We don't really have Waldos.
You can see the other snaps over at Ted's place, and though most are similarly crammed affairs, you will get some sense of how the scene has been recreated.