Yep, my job was making 45s for an 8 hour shift...it got pretty dull, actually, as I recall a fast worker on a good shift might make more than 500. The actual effort was to put a label on a little pin on each side of the record mold, then take a blob of hot vinyl from a foot triggered "vinyl dispenser" thingy, plop it in the middle of the label on the bottom mold, and close the press. The press had a timer, and would open up when done. You'd take the pressed record and put it on a cutter, hit a button, and it would spin the record, trimming the excess from the outside and cut the large hole in the middle. You'd take the excess material and put it in a can, this stuff was recycled. Then you'd put the completed record on a spindle. It was loud, hot, and you stood in one place for the entire shift. The presses were steam heated. The labels came in boxes of a thousand, and they arrived wet, we needed to dry them on the metal tables. Leave them too long and they'd burn, too wet and they'd stick together. I used to have a very high heat tolerance, long gone now.
Workers would come by once in a while and take a sample from your spindle and take it to a soundproof room to quality check them. I don't know what the equipment was in there, but it sounded pretty darn good, but looked pretty low tech and industrial metallic. The most frequent fault were easily spotted, little bubbles would appear in the molds, causing dents in the product, the longer a mold was used the more likely you'd get dents.
I found the video intriguing as I saw a lot of people handling records without gloves, and touching the surface of the molds and lacquers, that never happened that I recall, we never touched the surfaces without gloves. We also had to wear hair nets.
And we got no product for free, but pretty darn cheap. Even though it was an RCA plant, we made lots of records for other companies, I remember a lot of MCA product. RCA was on a Country kick when I was there, but they also had David Bowie selling a ton of stuff back then. As a side benefit I also got to meet Charlie Pride and Dolly Parton, who dropped in for a visit. She was nice...and short. And blonde. And...well....you know. Pleasant..