When recognizing Yuzuru's jumps I have only problems with 4S and 4T (we discussed it before), also because he goes into these jumps very fast, he 'attacks' the jumps. But for example, his lutzes and flips are easy to distunguish because his Lutz is from a very nice, clear outside edge, while he jumps the Flip out of absolutely nowhere, very suddenly, out of steps (even though his Flip was called in the past, but he jumps it now from a slight inside edge).
After Axel and Lutz, to me, the easiest jump to recognize was Salchow, I even gave it a name, I called it the knock-kneed jump

It's not because of him, just in general it looks like skaters are knock-kneed at the take off of a Salchow.
4Lo is easy because of the X and it looks tilted
, and because of it, I used to have a mini heart attack that he would fall but I got used to it now. I think. I hope.