- Freddie Highmore George Zinavoy
- Emma Roberts Sally Howe
- Michael Angarano Dustin
- Sam Robards Jack Sargent
- Rita Wilson Vivian Sargent
- Blair Underwood Director Martinson
- Alicia Silverstone Ms. Herman
- Elizabeth Reaser Charlotte Howe
- Jarlath Conroy Harris McElroy
- Ann Dowd Mrs. Grimes
- Marcus Carl Franklin Will Sharpe
- Sasha Spielberg Zoe Rubinstein