Ralph Foody then
The man who played Johnny, the actor playing in a film in a film, was named Ralph Foody. He was a veteran actor who had been involved in the business as far back as 1965. We think it is safe to say though that his small part in Angels with Filthy Souls was his biggest role.
Sadly, it was also his last role because the actor would pass away after the movie was released in 1999 at the age of 71. Apart from the Home Alone franchise, he was also a part of a police detective show called Code of Silence where he played a man named Detective Cregie.