Which was sometimes frustrating, but when they are funny and good bugs it's amazing they can't be patched out.

There's a reason so many speedruns on older consoles use the Japanese cartridges, because those versions came out first and have exploitable glitches which the western release later fixed.

Bugs at that time were almost never totally game-breaking either, fortunately. That could be a nightmare recall for the publisher, and so the final builds were tested more intensively than games now.