Other than that no because all other actors must be British. See related questions for more information.
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All Harry Potter cast members had to be British or Irish. The only exceptions were characters from other countries and Zoe Wanamaker who moved to England when she was young.
Some of the extras were also American, so long as they didn't have any lines.
Zoë Wanamaker, who played Madam Hooch, was born American, but raised British. Verne Troyer, who played a goblin in the first film, was American, but his voice was dubbed over by British actor Warwick Davis. American director Chris Columbus cast his daughter Eleanor in the non-speaking role of Susan Bones. That's pretty much it.
There is no janitor in Harry Potter at any time.
No, owls cannot talk. Even in Harry Potter.
Celia Imrie does not appear in any of the Harry Potter films
No, Alan Cumming has never appeared in a Harry Potter movie.
Christopher Lee has never been in any of the Harry Potter movies.