Desert Province

Bulblin Camp

The King Bublin fight cannot be skipped

The trigger that loads the path to Arbiture's Grounds doesn't exist until you defeat King Bulblin and break through the fences with a boar.

LJA on top of the Bulblin Camp

Originally discovered by Kazooie

Instead of making the whole trip through the Bulblin camp while fighting you can lja on top of the Camp to trigger the cutscene and skip the small key saving ~8 seconds.
The LJA is rather difficult because of the rather small frame window for a successful jump.
Note that its still faster to Jumpattack + Quickspins on King Bulblin.