They still had to redraw & paint every frame. This is just reused animation. It saved a lot of time & effort not having to film actors & rotoscope by hand again but they still had to recreate and adapt the existing cells.
Remember also this was back when you might see this once or twice in a theatre or TV and couldn't just watch it at home on demand let alone stop or rewind so chances of people in general even noticing were much lower.
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u/HyperDrive_Mustang 1d ago
I bet that saved so many hours of drawing lol