Exploiting Sprite Animations
From A complete guide to Super Metroid speedrunning
Interruptible Animations
All of these techniques are performed while unmorphed, with the first three involving the angle buttons.
Uninterruptible Animations
Any time Samus morphs, unmorphs, or turns around while unmorphed, an uninterruptible sequence of sprite changes is initiated. These have some useful applications for speedrunning.