Audio/visual unsynchronized: When Sally and Omer are talking in the club, there is jazz piano music playing and a man sitting at the piano. He is moving his hands on the piano but it clearly does not correspond to the music.
Revealing mistakes: The logo on Omer's jacket is backwards (film was reversed) when his cousin decides to become his coach.
Continuity: On the tray with the President's breakfast there's a small coffee pot placed right at the middle of the tray, obscuring the reflection of the camera. When the tray enters the President's bedroom, the pot has moved to the side of the tray.
Revealing mistakes: Sally's boyfriend and the production staff look through a dressing room keyhole. The keyhole is to a modern tumbler lock, which can't be seen through.