Near the end of the movie, when the Chandelier falls on Mukesh (Arjun Rampal), you see the entire Chandelier is broken, yet in the next scene you see the Chandelier still active up to Om's (Shahrukh Khan's) height, with him looking through it to see the ghost of Shantipriya.
When Mukesh Mehra (Arjun Rampal) is hit by the falling Chandelier, he falls in front of the crowd. Later on, when the crowd has disappeared, the chandelier is miraculously fixed by the time Mukesh Mehra regains consciousness.
In the scene where Om and his mother are looking at the moon through the window, the camera starts rising. In the background, you can see a crew member standing behind Khan and Kher, stepping back to avoid getting into the field.