Express.co.uk recently spoke to Caitlin Shorey, who plays a younger version of Rose’s character Clare Abshire, who confirmed Theo’s dedication to the series.
“They were wonderful,” she recalled. “Theo, he would always come to set and he would always have the American accent. He would talk in an American accent.”
Caitlin, despite being American herself, revealed she didn’t have to give her co-stars any tips whatsoever to help their performances.
Not only does Theo deliver a perfect American accent, but he chose not to drop it when the cameras stopped rolling between scenes.
source: express.co.uk