The first thing that I noticed is that Jisoo's shirt is tied. Why not just wear a crop top?

Shall we look at their footwork at 0:33?
Lisa: Baby steps
Rose: Taps whole foot
Jisoo: Taps toe
Jennie: Just slides her foot

Hmmmmm.......

At 0:45, is the formation supposed to be a butterfly? Cause that's what I saw.

At 0:52, if you look closely, Jennie went too fast. Whoops!

At 1:28, Jisoo didn't do the hair flip. Uh oh!

So that's all I got for Forever Young. Hope you enjoyed!