Spider-Man: Homecoming star Tom Holland is English and thus has an accent. He's pretty good at dropping his accent when he plays Peter Parker. If that sounds like it would be hard to constantly remember to do something like that after a long day of work it's because it is. Holland was being interviewed by BBC One when he told a story about why an entire scene in the movie had to be recut.
There is one scene—I guess [dialect coach] Rick [Lipton] wasn't there that day — where I went full English. And for some reason, no one picked up on it. And we're watching the movie, like going through it, like picking stuff out we had to change, and re-record. And I walk into this sandwich shop like, 'Ello mate, you aright?' He's like, 'What you want,' I'm like 'Pickles please!' and this and that [all in my London accent]. I was watching and was like, 'You do know I'm speaking with an English accent?' They were like, 'Really?'… So, they had to like cut it so you don't see my face as I say hello because… my accent was pure English.
To Holland's credit he does a pretty good job during the movie proper of keeping an American accent, though there are a few moments here and there but nothing that will take you out of the movie, but the fact that apparently no one noticed until they were editing the movie is amazing.
Summary: Following the events of Captain America: Civil War (2016), Peter Parker attempts to balance his life in high school with his career as the web-slinging superhero Spider-Man.
Spider-Man: Homecoming stars Tom Holland, Robert Downey Jr., Marisa Tomei, Donald Glover, Zendaya, Tony Revolori, and Michael Keaton. Swing on down to your local theater and check it out on July 7th.