Almost all exploits in this video use the Elixir of Giant Growth to get through objects. Keep in mind it doesn't actually have to be this elixir, you can use anything that enlarges your character, from the giant feast to heroism/blood lust/time warp. In the video there will be an indication on the top left whenever I use the elixir to make it clear what I'm doing. Watch out for those if you're interested in attempting these.
Most of these exploits are fairly easy to pull off. Feel free to try them for yourselves and have fun exploring. I tried not to show too much so people can view things for themselves, most of these zones are pretty big with alot of sights to see.
Well, except for Azjol-Nerub. That's pretty much the same. Cool skybox though.
Includes (in order);
9-Throne of Tides
Arcade Fire - The Suburbs
Amon Tobin - Easy Muffin
The Fratellis - Ole Black n Blue Eyes
Radiohead - No Surprises
Special thanks to VoTuUS, Dellion and Snookzx for some of their videos and tips, they were very helpful.