I remember the 8mm film cassettes used on SAA 747-100s in the late 70s. It was projected onto a screen at the front of the cabin - immediately above the bassinets (Y) - thus keeping the babies awake!
The early earphones were hollow tubes, feeding the sound from micro speakers built in the arm rest. might uncomfortable they were too.
At check-in: "Smoking or Non?" "Film or not?"