The accent questions make me think of a story from Fringe.
Anna Torv is a brilliant actress and if you listened to her speak as Olivia Dunham you’d never know she was Australian. This made it rather odd to listen to her in extras on set dressed as Olivia but speaking in her regular accent.
But she apparently destroyed a large number of cameras on the show because she had a specific kind of Australian problem.
She could speak American. She could drive American (on the right). But she could not speak American and drive American at the same time. On a number of occasions she would drive cars with camera rigs on the outside into light polls and sign posts.