http://dehacked.2y.net/microstorage.php/info/1879076957/Mars%26HL_SMBWarplessWalkathon_WIPto5-2.fm2
Finally this project is half-way done. 628 frames (10.45 seconds) were saved till 5-2. Time saving improvements are mentioned below (mostly found by HappyLee, except 3-2), but more improvements for entertainment waiting for you to see.
1-3: 21 frames were saved for better optimization at the mushroom and the last Koopa.
1-4: 21 frames were saved for a different strategy including going through a wall, and strict optimization for Bowser.
2-1: 166 frames were saved for jumping into the sky stage through a pipe for a shortcut.
3-2: 21 frames were saved for reasons known while making the first warpless walkathon TAS.
4-1: 21 frames were saved for a brand new strategy of pushing Mario to the right side of the screen and do the marginal flagpole glitch. 21 frames can be saved over the warped walkathon TAS using the similar way.
4-3: 378 frames were saved for a better strategy of kicking the shell, which saved a time waiting for the Koopa's recovering.
Levels done by Mars608: 1-1, 1-2, 1-3, 2-3, 2-4, 3-1, 3-2, 3-3, 4-2, 4-4, 5-1.
Levels done by HappyLee: 1-4, 2-1, 2-2, 3-4, 4-1, 4-3.
We'd like to thank everyone who enjoys the warpless walkathon TAS. Currently we've met a problem in 5-2 which would probably cost us 21 frames, and we don't have any better way to prove that it's impossible to get a perfect bullet like Mars608 had last time but to test it again and again in many different ways. So if anyone has time, please help us to prove that or to get a miracle that keeps the 21 frames in 5-2. Thank you.
Oh and another thing, the giant project: SMB maximum coins TAS was about to be half-way done, too. I think that is going to be the most epic SMB TAS ever! Thanks to the great effort from 87316156 and TEHH of making the run. I'll be posting the WIP here as soon as W4 is finished, and I'm sure it wouldn't let you down. :)
You may sometimes do that unconsciously on console. Is backward jumping a glitch? It's hard to define.
All in all, "glitchless" in SMB would never make a good goal. The game SMB is probably TASed to death by now (mainly my fault), but there are lots of things to TAS such like hacks or similar games. I'm sure you'll make great progress if you keep trying. :)