Finally got caught up on watching it all. A pretty great game. I could definitely get into it. It's like watching an entire game of no-time-on-the-clock punt returns Now I'm curious to see what standard 15-a-side rugby union looks like.
It was also fascinating to see the shadows of gridiron football from the two sports' shared long-ago ancestor.
* The defense having to stay back 10m when a free kick is taken.
* The kicking team being able to play a free kick once the ball has gone 10m.
* Goal posts up on the goal line.
* The phrase "in touch" -- read the NFL rulebook and you'll see it uses the phrase and talks about teams putting the ball "in touch". Though in the NFL "in touch" only applies to the ball crossing the goal line, not the sidelines.
* The word "touchdown" itself. I have to think that is a relic of a try where the ball actually has to be touched-down to the ground to score.
* The conversion after try/TD.
* Being able to score a drop goal in open play. That's analogous to being able to dropkick a FG. The parallel was closer before the NFL rules change 15 or so years ago that restricted drop-kick FGs from being taken behind the LOS -- before that you could do a drop-kick FG from anywhere on the field.
* The play not being over when the clock hits zero -- as long as the ball is in play at 0:00 you keep playing until the play is over (of course, the rugby definition of "play" is a lot broader than the NFL one).
* Shape of the ball, of course
I imagine there are more.