Andrew Garrard , Jun 01, 2011; 08:43 a.m.
Hi Joe. I would guess one of:
a) The photographer wanted a deliberately grainy look, or
b) The camera was set up to capture fast action (which, admittedly, there doesn't appear to be in this shot - assuming you mean the first of this week's) and the settings were an accident, or
c) It just didn't matter - ISO 800 is reasonably low noise on modern bodies, so maybe the camera was set to ISO 800 knowing it would be "okay" (with the expectation that photos would be taken in low light during the same session), and used in aperture priority.
At ISO 200 there would be slightly less noise/better sharpness (depending on the noise reduction) if the only motion to be worried about was normal camera shake, but - especially at the size presented - whether you'd notice the difference is another matter. Maybe something was moving fast enough to justify a 1/800s shutter speed - if the photographer was in a moving car, the settings worked very nicely!