Some rough notes while going through some factory documentation I was lucky enough to receive:

• Option G66, "Air Booster Rear Shock Equipment", gave you a shraeder valve at the back license plate where you could air up your shocks
• The 327 was still used for export models (right hand drive)
• There is -supposed- to be a displacement sticker (they show 396) over the 1-Team Tonawanda engine sticker on big blocks
• The hood light DOES move side to side.  Driver side for small block, passenger side for big block and inline 6
• The oil change sticker follows the light (if equipped) and the sticker should be upside down for easier reading
• For the european market option T94 cut amber signal lights into the rear metal bumper
• There is support for 3 speakers, 2 in the rear and one in the front, depending on the combination of stereo tape player and FM stereo that you had
• Speakers are shown with a backing box on the trunk side, but I've never seen that
• Per North, all but the GP had speaker grilles - the GP had a mesh style package shelf instead
• A rear power antenna is listed in the front RPO list but not in the detailed option instructions, so may not have existed
• A rear manual antenna (like my 2+2 now has) is detailed under option U73

There's a master RPO list up front that doesn't necessarily mean they made it, but at least they had a code for it.  It lists electric rear window defog, for example, which I think was Grand Prix only that year, if anywhere.  But there are option codes like "U30 - Aux Gauge Panel" that I'm not sure what to make of.

Anyway, that's just from my first look, I'm sure others will have more input!

Dave