NFL on FOX rules analyst Mike Pereira breaks down Week 4

It's no secret that officiating has been a hot talking point all offseason.

The league has stressed its new points of emphasis and we're all wondering how dramatically it will affect play on the field in the regular season.

With FOX Sports rules analyst Mike Pereira on hand, follow all of the questionable rulings and flags thrown on Sunday. Pereira, who retired as the vice president of officiating in 2009, offers an informed look on Week 4's slate.

Stick around. You might just learn a thing or two.

(Note: You should see a chat window featuring commentary from Pereira in between this paragraph and the one above. If you don't see the window, try refreshing your page.)