I really didn't notice how long the video was as I was busy trying to absorb all the information being provided on-screen and, simultaneously, marveling at the hard work and sheer technical brilliance of the French Space Guy, the creator of the video. Hats off to them.
Most likely by ground teams operating the spacecraft remotely. There isn’t much for humans to do in a spacecraft that can’t be done by automation, unless something goes wrong.
Most of them are sequenced. Around 6:10 the video goes through a series of buttons, most of which are called "Backup switch to do X" because when everything goes as planned, no button push is needed to perform the action.
Given the date and that it's a Saturn-1B, that would make it AS-202, one of the early test flights. So instruments probably real, but not final hardware.
'Tis, and in the video the maker explains what they had to do - telecine 16mm film, stabilise, upscale, and interpolate from 5 -> 30 fps, as well as generate plausible sound from the spectra provided in the original test report.
