Yellow fog lamps were used from 1980 onward and powered right hand mirrors became standard in 1983. I don't know about the year but early models had oval-shaped signal lamp bulb holders that weren't twist-on. There's a bunch of info from
THIS THREAD, the two ought to be merged. Very good information!
I'm curious if anyone knows about the interior trim between years/models. Most have zebrano, but I've seen a few with black plastic and I know the early coupes (up to 1979 I think) had burl wood.