Tom Holland, the current Peter Parker in the ever-growing Marvel Cinematic Universe, was talking about the highs and lows of playing Spider-Man with the BBC. And maybe because he was sharing stories with a UK local, he slips in this great story about how easy it is, as an actor, to fall back into your native tongue, even though you are supposed to be playing a kid from the outer boroughs of New York City.
For the most part, Holland does an impressive job of maintaining his American accent.
And when it ends up being chunks of dialogue, as it was in this sandwich shop scene, they have to recut the footage to work around this issue.