Hmmmm, I've never noticed one with all the headlight wiring inside. Everyone I have, and remember seeing; the wiring comes out of the top of the rear of the headlight housing, and goes into the handlebar tube, with grommets (if they haven't rotted out) and about 3 or so inches exposed.
The older style motors have a smaller fan cover. Round. The shrouding is also thinner, and more complicated. Usually dented and scratched up easier. I am not positive if they all had a decompressor valve, but I think they all did, due to the bigger pedal gearing. When you pedal the older style, you can really get the bike up and moving!
The newer style motor has the larger fan cover, and has a small "bite" out of one side to accommodate the pedal shaft. The shrouding is thicker, and can polish up very nice. It also comes off and goes on real easy. No decompression valve. The pedalling is small geared, and even in 2nd gear, you could barely pedal the bike fast enough to make it worth the effort. This is why they had the valve on the older style, as it was harder to get it turning over while starting. It also works as a kill switch, but when you squeeze it in when you first pedal, it makes it easier, and then pop it closed as you actually start it.
The older motor has a larger pedalling fulcrum.
My current daily rider 010, has a kill switch. It's on the same box as the horn button, and matches the horn button. My other 010 never had that. My 020 also has one. This would make the wiring slightly different than the ones without a kill switch.
Another thing too; the maroon bikes had maroon rear racks, same style as those cream colored ones you have seen on the red/cream bikes.
The larger newer shocks have a bullet-shaped top, as the older ones have an exposed grease zerk. The older ones allow the bike to sit about an inch or so lower. My wife likes that, as her DeLuxe has the older style ones.
Tanks too. The old maroon tanks were slightly smaller, and a little bit squarer. Hard to see much difference, but there is a tiny bit. The tops on the tanks are also different. The older ones have 3 raised stripes going lengthways as the newer style has a V shape in it. They also differ slightly in size and shape, but barely.
I am not too up on the blue and white bikes, and their differences. I have seen their wiring is better. Better headlight bulb sockets, etc. I also have noticed they have a different transmission case, without a dipstick. Instead; they only have an overflow plug hole.
I think some Allstates may have even been sold new with an extra airbox, that mounts to the side of the frame. I like those, and still want a couple of'em. Supposedly the DeLuxe was sold with them, but I don't think ours ever had one. I think the blue and white ones eventually had sidepipes too, but I'm not sure about that. Oh, and the DeLuxe has the newer style tank, but with chrome and maroon.
The 1st year mopeds had a simple tail light without a brake light. Just one bulb, and was a more oval shape on the back, like a mini late 50's VW Beetle. They sold replicas of these at Motor West for awhile. I wanted to get a couple while they had them, but missed out. As far as I know they only had them on the 000's, and possibly not even all of them. The one of mine that was painted light blue had one.(edited)