Factual errors: During their first djembe lesson, Tarek tells tells Walter to stop playing a 4/4 rhythm. However, even though Tarek talks about playing a 3/4 rhythm, they play a 4/4 rhythm.
Crew or equipment visible: During the night shot of Manhattan from New York Harbor, the wake of the camera boat is visible in the lower left hand corner.
Revealing mistakes: As Mouna (Hiam Abbass) and Walter (Richard Jenkins) are becoming closer, Mouna calls Walter "Richard", his real name, rather than the character's name.
Continuity: When the student comes to Walter's office to hand in his assignment, the first shot of the student standing in the doorway next to the bookshelves shows a book called "Numerical Recipes" which is a well known text in computer science and thus rather out of place in Walter's office. In all subsequent shots the books are more in keeping with an economics professor, suggesting a re-shoot of the first scene.