Larry Anderson was actually reserved, mostly because he didn't know the rule.
There are two ways to look at this: 1) You can only review for a home run- meaning that Jack McKeon would have had to ask Joe West to review Pence's double to see if it was a home run. From there, West could, according to a former umpire, make any call while in the process of reviewing. A ballsy, perhaps genius request by McKeon. Or, West reviewed on his own, though that didn't appear to be the case. 2) McKeon asked West to review for fan interference on a double- something that is not reviewable. It's hard to know since there's nothing in the rule book. Another Bud Selig boner.