This/these exploits have mostly been rather poorly documented before in some sense, but often without explanations or cohesive causes.
This thread is to properly document them and give you an idea of why they happen in hopes you, the community, can take them farther.
First, instantly remounting as you dismount in Netherwing Ledge.
http://www.mmowned.com/forums/world-...g-ledge-2.html
Cited here- The cause is having ANY self-cast buff on yourself. This is especially noticeable for anyone with pets, as they summon upon dismount, which causes you to instantly remount.
The questline to be able to get the costume is "Kindness" Kindness - Quest - World of Warcraft
You can use this bug to kill/gank in the area and fly away automatically in-combat by either casting a buff on yourself while fighting(I didn't get a chance to see if the buffs from procs caused an auto-mount) or changing an existing buff, like a paladin's aura.
The video below details the bug in action. I also showcase the ability to use remounting during a cast, like hearthstone or Dartol's Rod of Transformation to become a standing furblog on the netherwing mount, or being able to teleport to ZD while mounted(alternatively, you could teleport anywhere else that has an outdoor hearth location- EXCEPT Azeroth. I know, I tried).
For the costume effects, try as I might, the pirate was the only one I could get to happen at the same time with the mounting effect. I used the trick or treat candy. Ghost mounting at the same time produced a split-second visual effect before going away. Skeletons refused to mount. The wolf disguise from the offhand also wouldn't work. Only Iron Dwarf and Furbolg seemed to have an effect.(My Wolvar funked out and it may work in the end)
Finally, swimming.
It seems the three total effects of "swimming" in air are:
1. You can loot without "dismounting"
2. You can no longer cast, even when you're touching the ground when it would normally dismount you in order to start a cast
3. You cannot be knocked off of your "mount."- Skyshatter questline
The replication of the trick is simply casting buffs on yourself, or in the case of a pet owner, right-clicking your flight buff over and over while your pet buffs you instantly until you appear to be swimming or unmounted with the mount buff.
Again, I recognize that most of this information exists around, but it's poorly documented at best, and causes of the bugs aren't well or often attributed. Furthermore, a few of the items are original.
EDIT:
Adding the bug to fly your multi-seat mammoth mount~
This bug has no SUPER practical purpose unless you're an engineer, utilizing the bug to taxi TWO people around in Northrend. Still fun. Sadly, the Rocket passenger mount doesn't share the same funny visual effect.
http://www.mmowned.com/forums/world-...-outlands.html