The difference between her SP from Skate America and Vancouver was 2.22 points or 2 percent. She got a tad higher PCS in the SP, 1.52 points or 4 percent.
The biggest difference came in her FS. 16 points, or a 12 percent difference.
However, Yuna had not skated a clean free program leading up to Vancouver. If some of you recall, she actually got beat by Rachael Flatt in the FS at Skate America after falling on her 3F, getting 3 downgrades (which what < was at the time and popping her 3Z into 2Z<. At Trophee Eric Bompard, she basically missed her 3F costing her 5.50 points. At the GPF she only did a 3Z-2T, UR on her 2A-3T with major -GOE
So add 5.5 points to her Trophee Eric Bompard FS TES (which was clean otherwise) and you got 73.05. That's just getting a 3F at base value. At Vancouver she got 1.80 GOE so add that..74.85.
The PCS difference was much higher at 8 percent or 5.36 points.
But if your recall the FS, the judges were giving out +GOE and +PCS like candy. Pretty much all the skaters who skated clean got a boost in +GOE and +PCS that night leading to a whole ton of personal bests. Joannie Rochette, for example, went from 56.72 at GPF to 68.48 in Vancouver. Laura Lepisto got 62.72 in Vancouver compared to 59.20 a few weeks earlier at Europeans.
So I don't think Yuna's score improve is that hard to explain.
Thanks for the breakdown, Mrs. P. I agree with your overall point, but I just want to add a few things:
Yuna got two level 3 spins and a level 3 spiral sequence at 2009 TEB FS, and got all level 4 spins/spirals at 2010 Olympics FS. So that, in addition to the added 3F and the GOE for the flip and spin levels (which increase with higher levels), increased Yuna's TES.
There was a PCS increase for the clean skaters in Vancouver, but I don't see the +GOE boost in Vancouver--for any skater. The way the judges did +GOE that season remained relatively consistent throughout the season, regardless of skater.
Yuna's 3Lz/3T received the exact same GOE in both Vancouver and TEB FS. Of her other 5 jumping passes, 4 of them received a mere +0.20 higher in Vancouver than in TEB, which is essentially the difference of ONE judge giving her an additional +1 to what the judge gave in TEB--it's a statistically meaningless difference. The only other significant difference was her 3S got +0.6 more at the Olympics than at TEB. Her 3S has an unexpected entry and a creative exit, and I suspect the TEB judges weren't able to accurately gauge how difficult that made the jump since it was her season debut and it was the first time they had seen that.
The Rochette and Lepisto examples aren't good examples because Rochette was terrible at the GPF and Lepisto was also better at the Olympics than at Europeans. However, PCS did increase overall at the Olympics versus the other competitions, but no single skater was the only beneficiary.