I first discovered this when playing around with the game when I first played it on emulator. I thought was the 1st one to discover this at the time only to be proven wrong here.
Even tho I played this game a lot as a kid, I never knew that landing on the ground after getting enough 1-ups from stomping on enemies had a special animation
This Left+Right running glitch is only in the SNES and GBA versions. SNES and GBA have mostly the same physics, with some exceptions, and the level design is overall identical. The GBA version has several changes in physics, more levels have been slightly modified and the camera will be locked at the places where you can clip through the walls in NES and SNES. So yeah... It depends on what you are comparing =).
2:50 I really prefer the original NES version of these levels where the background was completely black. It was heaps scarier, felt like Bowser's world was in perpetual darkness
Wait, you can use the warp whistles to warp directly to world 8? I thought you could only warp up to world 4, and then after you beat it you could only warp to world 7!
All the levels of this speedrun 0:02-0:28 Intro 0:28-0:48 World 1-1 0:51-1:13 World 1-2 1:19-1:43 World 1-3 ( 1st Warp Whistle ) 1:48-2:04 World 1-Fortress ( 2nd Warp Whistle) 2:11-2:39 World 9 Warp Zone 2:47-4:11 World 8-Tank #1
The author's comments on the GBA differences are interesting. It's surprising the nuance that goes into optimizing various ports of the same game. Also, every ported game on GBA is a reminder of how awful the sound card was. Such a pity on an otherwise wonderful portable.
It's because it's all generated by software (besides the original Game Boy sound) playing through two 8-bit (at best) PWMs. And most games were optimized to sound reasonable through the tinny built-in speaker, anyway