That only covers the key moments of the run. Niftski made use of a frame-perfect wall jump and an incredibly difficult fast acceleration before the second wrong warp to get a low enough time for 4:54.
Timing ends on the frame that Bowser’s axe is grabbed, not the framerule that it is grabbed, so every frame counts on 8-4. 8-2 includes the infamous “Bullet Bill Glitch” to trick the level into ending two framerules early another frame-perfect trick, as well as the “TAS 8-2” setup, which involves getting to the end of the level at such a pace that was only recently determined to be humanly possible thanks to new setups. Doing this, plus the flagpole glitch at the end, allows him to catch the earliest possible framerule with zero frames to spare. These are all frame-perfect inputs that allow Mario to reach running speed quicker and must be started on the first frame possible, with no cue as to when that first level frame is coming. Niftski had to hit left on the first frame of the level, then jump and hit right on the third frame, and release jump on the fourth frame. 
8-1 features what is known as a fast acceleration on the first frame of the level.The first is used to access the warp zone quicker, while the latter is used to push Mario further to the right side of the screen, a requirement for the first “wrong warp” glitch.
1-2 and 4-2 both include frame-perfect wall clips.
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