Overhead racks or overhead bins with net-type "doors" (in a DC-9).
Movies on reels in projectors pulled down from the ceiling.
A complimentary 4-pack of Marlboro in business class.
Onboard magazines showing "special" meal choices.
Plastic trays with fitting cups and plates which as kids we used to take home and re-fill for cold dinner occasionally.
Greenery or even trees between terminal and apron (still visible at smaller eastern and southern airports but mostly gone elsewhere).