Ah yes, gotcha - I hadn't spotted that. But in that case we have no idea how many of those 800 or so direct referrals came via QR. Could be 800, could be 1. Interesting though, and ta for flagging it up.
FWIW I did something similar here: http://meshedmedia.com/a-quick-qr-code-case-study-odd-future-on-late-night-jimmy-fallon/