I can only speak for Rugby Union, because I'm obsessed, but the differences between the NFL and Rugby Union are huge. A game lasts 80 mins with 15 players, forwards and backs. The ball cannot travel forwards. There is attacking and defending teams but this can change instantly because rugby is played openly, not in the stop/start manner of the NFL. Scoring is based as so; 3 points for a penalty kick which can be taken from anywhere in the field and 5 points for a try. After a try is scored there is the chance for the team to kick a conversion and come away with 7 points. That's the basics, the rules of rugby, which are quite complicated, show more clearly the vast difference between the two sports.
Sjung för gamla Djurgår'n
Lock the gates, make them watch...