Errors are part of human nature, and it happens in sports, period.
Whether it's the NFL or any other sport, no referee, judge or umpire is perfect.
Well, there's clearly been some questionable calls from pro football's replacement officials, and we're only one week into the 2012 season. On the bright side, Week 1 was definitely better than the preseason, so improvement can be expected.
Also, we have to keep in mind that even the NFL's regular referees weren't perfect. So, a little leeway can be given to the replacements.
Nevertheless, just like an athlete messing up his or her responsibility on a particular play, the mistakes on film garner the most attention.
All videos courtesy of NFL.com.