I've read several articles this morning that the Bears had noticed from film of the LVR games there was a key to how to get a jump on the ball being snapped. Here is a paragraph from a fantastic article on the NYTimes.com/Athletic site:

Quote

It’s barely noticeable to the naked eye. Las Vegas Raiders long snapper Jacob Bobenmoyer may not even realize he’s doing it, a very subtle tilt of the football just before he lets it fly to his holder on field goal attempts. But there it was for the Chicago Bears last week, this seemingly minuscule scouting nugget unearthed for preparation purposes and helping boost the confidence of the team’s field goal block unit.

The article is excellent, going into depth with the players about the blocked FG. I found it one of the best I've read to enjoy a 'feel good' moment:

Bears magic trick: How Josh Blackwell’s blocked field goal saved the day in Vegas

If you cannot access the article (some content on the site requires a subscription), there is another article on SI.com:

Josh Blackwell's 'out of body experience' and Bears' good, bad and ugly

 

Love it.  Blackwell said it in his presser.

Have to give Scot Daly credit, I believe he was the one that brought it to the attention of the team. 

Josh freaking Blockwell!!!