1970s American cars can be so weirdly optioned. This is very low option car without AC, but it has the optional power tailgate release. http://seattle.craigslist.org/tac/cto/5524713637.html
In Washington state, I can see no AC. Could be an end-of-year car. I worked for Chevrolet dealers on and off from 1970-1972. We used to get weird combinations near the end of the model year if it wasn't special ordered, like a green truck with a red interior. The assembly plants were just using up the remnants, I guess.