I do a lot to fade into the background and avoid any attention or interest from anyone (when shopping, for example). People seem to rely heavily on unconscious instinctive and emotional behaviors when in a crowd. I find it mostly disgusting and pathetic but also a little dangerous. The zombies could mob and lynch at any moment.
I have on occasion recognized others using a similar [avoidance] tactic. So I guess even in this situation it is possible to spot one of us in a crowd.
