I refuse It matters on personal opinion and Growing up with it, Go somewhere else with your questions.
In all honesty I am not saying this to be a dick, but Europeans would not understand, we grew up with this sport it is a part of our culture, It has many rules different then rugby and I am sure someone else would love to answer them, but there is no way to explain this to someone who is not american.
Here are the Rules,http://en.wikipedia.org/wiki/American_football_rules Now What is it you want to know...
No. Never. You have to win the Super Bowl too! And by the way we went 16-0 by the end of the year. Pats went 18-0 but didn't win the Super Bowl. They didn't break the record.
Last time I checked last season does not effect the season they are currently in. While its a nice stat, it does not mean crap.
May I also say that all that matters is what your record is currently in the season at hand. It does not matter what your record was before only what your record is now or will be in the future.