Sweet patience-trying perfectionists! They're going to have a look at the last play, perhaps because the guy in the booth finally got the webcast working and he wants to show the head referee the camera angle from inside Percy Harvin's nose.
(In his defense, that would be a pretty cool — and speedy — vantage point.)
Update: They were reviewing to see how much time should be on the clock. So, technically not a review, but also not technically not-annoying.