Hi. I've found a lot of stuff that might be helpful for the TAS.
Furnace Fun Tile Skip
http://www.youtube.com/watch?v=bqtZRhHgBd4
It's possible to skip even further than what's shown in the video using the same principal.
Ice Clip in Click Clock Woods
http://www.youtube.com/watch?v=k0sFDCrrmN8
This clip might be a faster way of leaving the water in Click Clock Woods (Winter) after Gnawty's house =O
Faster(?) Gobi's Valley Grunty Switch Jiggy
http://www.youtube.com/watch?v=ZaVmFq_lgfk
This seems faster than doing a ground pound, but I haven't timed it.
Boss Boom Box Jiggy Animation Skip
http://www.youtube.com/watch?v=ZygY3AGByh0
This is an easy spot to skip the jiggy animation. It's doable in realtime even (with a bit of luck).
Beehive Clip in Click Clock Woods
http://www.youtube.com/watch?v=lLsOyN8abD0
This was shown to me by a Japanese BK speedrunner, but if OOB warping is allowed it might be useful.
Object Teleportation
http://www.youtube.com/watch?v=wJODJbpZYq8
I have no idea how this works, but maybe a more experienced TASer can figure it out?
Hut Notes in Bubblegloop Swamp as Banjo
http://www.youtube.com/watch?v=_PzFLbCRMRs
This probably isn't faster, but I'm sharing it in case it somehow is. It's possible to get out (check description for link to that video).
Faster(?) Bottles Skip in Spiral Mountain
http://www.youtube.com/watch?v=-z_djaBRDqY
I don't know if this is faster or not, but it's a setup I found for realtime speedruns.
There are more videos on my YouTube in this playlist:
http://www.youtube.com/playlist?list=PL3487DD6B9369E284
Hope I helped :) Let me know if you guys figure anything out about the Object Teleportation thing =O