Cool video.
A few things that stick out to me are the gearing choices, wheel/tire combos, and the IRS systems.
The Camaro has a rather large CI powerplant, with an excellent TQ curve, and is geared substantially higher at 3.91 vs the DOHC Mustangs 3.73.
I have always been under the impression that DOHC engines perform better in just about any environment, with a steeper gear in comparison to an equally powered (peak) pushrod / larger CI engine.
The wheel & tire packages are also vastly different. The Camaro is sitting on 10" front, and 11" rear wheels....all 4 corners wrapped in GY Supercars of the 285/35 variety. The Mustang on the other hand, is sitting on 9"F and 9.5"R wheels wrapped in 255/40 up front, and 275/40 out back. This particular comparison peaks my interest, because I would highly enjoy seeing the difference in the Mustang's handling with the equivalent size wheel&tire package. Props to GM on shipping those 1LE models with square 285's.
Another difference that intrigues me - is the IRS Systems. The Camaro's IRS is completely different in design, compared to the S550.
I am not sure how much this affects the performance difference - but in watching that video, it seems as if the entire package on the 1LE is a winning combination (for what it is)
Personally, I think the IRS system in the 2010+ Camaro is nice. I am not sold entirely on Ford's decision to go with the single 1-Piece LCA, but I think time will tell.
I did find it quite funny how the cars weighed in within 70lbs of each other. I agree with Terry, in that, that is a shame. Model for model, I would like to have seen Ford keep that spread at around 100lbs, minimum.