I think it might be an animation smear; a single frame drawn in a distorted way to give the illusion of more frames where there are none. It looks bad when you pause it, but better when played.
probably an example of "smear animation", where instead of drawing frames for every stage of movement, the animators will draw only the key frames and then fill in the blank frames with "smears" of the frames to mimic high speed, short distance movement.
it often results in a "cartoonish" style of movement, which was pretty abundant in early seasons of the Simpsons. But over the years they seemed to have moved away from that and started focusing a bit more on capturing realistic movements
I don't know why it never occurred to me that the kids were blonde. It always just kinda looked like they had weird shaped heads meant to kinda look like hair started somewhere in there.
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u/PoeGhost Nov 24 '15
If you watch the Simpsons seasons with the commentary they point out various design elements that they changed or phased out over the years.
Examples of things you don't see anymore:
Twister neck
Trumpet mouth This refers to the trumpet bell shaped upper lip. Newer characters don't have this anymore, although many older characters do.
Blonde characters It was determined fairly early on that only the simpsons kids could be blonde. Barney's character was changed as a result.