Secrets: Warps, Nurses, and Bonus Stages

So there are three kinds of bonuses that you can get after completing a level:

Bonus Stage - A short stage where you can pick dozens of blue jars and ? jars.  There are multiple versions of this, and the more you go to in a continue, the harder they get.
Bunnygirl - She'll send you ahead as if you beat 2 more stages.
Nurse - She'll give you three lives before sending you on your way.

On a casual playthrough, it seems like these come almost randomly, with certain stages seeming to give you one of those more often.  But I've found that what's actually happening is that certain stages will give you a bonus if you finish them in a specific lane.  Below is a list of what should be all of them, with lane numbering top down.  However, I swore I had once gotten a bonus stage on a level that didn't seem to have one when I checked, so it's possible that there could be some other way to trigger them in addition to this.  Or maybe I just misremembered.  In any case, let me know if you find any that are not listed.

Stage E:
Lane 2: Bonus Stage

Stage F: 
Lane 1: Bunnygirl warp to J/K juncture.

Stage J:
Lane 4: Nurse

Stage K:
Lane 3: Bonus Stage

Stage L:
Lane 1: Bunnygirl warp to P

Stage P:
Lane 1: Bonus Stage

Stage R:
Lane 4: Bonus Stage

Stage S:
Lane 4: Bunnygirl warp to Z

Stage U:
Lane 4: Nurse

Stage V:
Lane 4: Nurse

Stage Z:
Lane 3: Bonus Stage


A note about the warps: if you check the map, you'll notice that taking the first warp will send you past the point where you can go to the second warp.  It is still technically possible to go back there by dying and continuing, as that will bring you back to H/I juncture, and you could then proceed to I and take the lower path.  However, given the time it will take to kill yourself like that, the fact that this turns your two level warp into just a one level warp, and that it forces you to go through the difficult and dangerous I stage, I'm not sure if that will really save any time over just skipping that second warp, so I didn't bother on my run.