Hi DrD2k9,
Letter world should be accessible via this method on original hardware as the game adds a star to your save file when loading the ending music in 8-4 and as long as you have 8 stars on the title screen you are able to access Worlds A-D.
Definitely a yes vote from me. :)
A couple of thoughts though:
2.1: Maybe you can hit the flagpole lower, just to the point that Mario is at 24 horizontal speed when he lands.
7.1: I believe it's possible to perform a FPG along with the screen-wrap; you just need to avoid being all the way to the right when doing so.
These two I think could make for improvements in your run, but I could be wrong.
That is all; great efforts otherwise!
Hi Asumeh,
I just tested your timesave proposal in 7-1, and unfortunately it comes out to about the same as without Flagpole Glitch. The problem is when Mario is all the way to the right, if the pole has not loaded then Mario can instantly get off the flagpole base when turning around, rather than waiting around 24 frames on the right-side of the flagpole base.
As for 2-1, I don't think that'd be possible to save time that way as Mario reaches peak speed in the air anyway and would only save time if the level completion music kept playing after the level end timer hit 0.