The basics off the top of my head...
Burstbucker 1 & 2 pickups
MRW fretboard (I believe at least part of the year)
Long tenon
Correct pointed inlay shape
Black-bound COA
Black Custom Shop case
Compared to more modern ones (in case you're wondering)...
No aniline dyes
No hide glue
Different inlay material
Truss rod condom
Slightly different pickup spacing
Single ring, double line Gibson Deluxe tuners
The list could go on and on, but the best option is to check out that thread. Hope it helps!