One piece of information about creepers is, they are obsessed with music! Think about it. Every single one of them has a disc on them. Creepers rock out!
Of course, those discs are obliterated when they go boom, and somehow just get irreparably damaged unless the creeper is slain by the delicate piercing of a skeleton's arrow. But plant-based or not, those creepers really like their tunes!
Regarding the house in the video. I don't think that's Herobrine's mansion. I think it's similar. Very similar. But, I think it is a different one. If anyone knows, throw a shout.