Sentence:  Instead, replay turns sports fans into sports rulebook lawyers, <WSD>Zaprudering</WSD> clips frame-by-frame to determine if something took 2.4 or 2.5 seconds, and getting indignant that the clock operator didn't immediately notice and react to Cousins tipping the ball, even though the announcers and most fans didn't notice until watching a replay. 
Meaning of the word marked with <WSD> tags:  To study (a piece of footage) closely.