Sometimes there will be a movie or TV program where nobody is subbed, except the one person with a completely understandable foreign accent. That is a phenomeno

Sometimes there will be a movie or TV program where nobody is subbed, except the one person with a completely understandable foreign accent. That is a phenomenon I have seen. Usually in media for an American audience, from what I've seen. (A lot of Americans have trouble even with native speakers from the UK, Ireland, Australia, New Zealand, etc. We as a nation seem to have very little patience or habituation for accents.) It's the broadcast equivalent of your first scenario.