Coaches are not allowed to challenge plays that are automatically reviewed by NFL officials, like fumbles. Throwing a challenge flag results in a 15-yard unsportsmanlike conduct and, if the flag is thrown before the booth buzzes down, the challenge is nullified.
Packers head coach Mike McCarthy must have forgot. Fortunately, Jordy Nelson was there to help by trying to hide the flag.
gif is on the page...
On another note since when did Aaron Rodgers turn in to Tom Brady? No, not the good QB way, but the whining to the refs and yelling at his linemen way.