Really_Tall | Super Mario 64 DS - Behind the Waterfall Faster Entrance @Really_Tall | Uploaded 8 years ago | Updated 2 hours ago
The previous strat was to start with the Luigi cap, and use the other Wario brick to clip OoB. From there you'd fall into the water, swim to the island, backflip to the door, and then take the path to the loading zone.

This strat works because loading zones are always loaded, even when a room isn't loaded. I clip OoB in the red coin room and then fall straight to the loading zone. Because of the positions of the two rooms it's necessary to move along the seam for a bit before falling.

This strat saves about 5 seconds, and there are two stars in Behind the Waterfall, so that's 10 seconds saved for the 150 Star TAS!

This strat should be RTA-viable by doing a backflip with Luigi after clipping with the block, but I'm not sure if it's still faster that way.