Extra Hyjal Rep (scale of sands) you didn't know about!

Once you clear the first 2 bosses, more adds spawn(2 waves)

Clear the next 2 bosses, more adds spawn(3 waves)

GO BACK TO THE ALLIANCE BASE! 

Re-trigger add waves from walking through Arc where first waves of instance came from.

Go to Horde Base. YOU will get a infernal pack. 

Kill Archimonde.

Go back to Alliance Base for 4 more waves. 

Horde base will occasionally have 2 more waves if you go back to there after. It takes some time.

With perks you you can go from Neutral to 5k into honored in one run.

If you leave this instance for more then 2 hours after completion this will not work.