The rule for replays is supposed to be that the call on the field shall stand unless replay shows INDISPUTABLE video evidence sufficient to reverse the call.   That is widely ignored now.   Time after time,  I see replays ignore what is called on the field and reverse calls with nary a shred of evidence.  The TV crew announcers are repeatedly left scratching their heads,  when calls they all unanimously concluded that there was not enough evidence ,  or in many cases even seemed to confirm the call on the field,  are claimed by the officiating crew to be sufficient to change the call.  So go figure.