GE Tubs:
All the GE's I was around in that era had a plastic-coated interior trademarked PermaTuf. As I think I've remarked here before, it wasn't very perma, and it was none too tuf. Every GE I had in those years suffered liner problems (rust making the liner bubble up) at the bottom of the door and at the lip of the tub opening. The hinge area was another rust-prone place.
Upper-series machines may have had something besides this; my experience was always with MOL machines.
bajaespuma, thank you for mentioning the detergent dispenser! I always thought I was doing something wrong. I tinkered and tinkered and tinkered with mine, to absolutely no avail.
Oh, and wasn't that silly bowl rack fun?