In the last scene, where Saif Ali Khan is proposing Diana Penty for marriage, the camera keeps on switching from his face to her face and vice-versa. In this sequence, we get to see that Diana Penty's hairstyle changes every time (when the focus is on Diana, she is seen with left and right thin braids stuck to her back hair by pin. But when the focus is on Saif Ali khan, we get to see Diana's back hair and there are no braids stuck at the back. A side shot of her hair reveals that there are no braids also. That means Diana's and Saif's shots were taken at different time. When Diana's shot was taken, she had braids. But when Saif's shot was taken, she had no braids! Seems to have bypassed the editor's eye.
In a scene, Gautam is shown dialing a phone number from his iPhone. But when he takes the phone to his ears, the screen doesn't get switched off as it would happen in any iPhone on dialing and bringing it close to ears.