Expectations change based on context.

For example, when watching 80's TV anime I know there will be animation mistakes. Something will change color for a frame or two. A cel won't be aligned properly. No problem. It's part of the charm. But, let's say I then put in Disney's Rescuers Down Under. Great film, underrated. But, in the middle, TWICE there's major animation errors. First the eagle feather is on the wrong cel layer in the nest for a few frames, then later it shows up in the bad guys hat before he puts it there.

Now, it's the same problem in both cases. But, the difference is, the second is a fucking DISNEY movie! You expect BETTER from them! What is fine in one place, is inexcusable in another.