When Aakash orders champagne to his presidential suite, he tells the room service person to get two glasses. The room service attendant is still walking towards the table to keep the food and get glasses, but the glasses have already magically appeared on the table in front of Aakash.
At the end Aakash comes to Reena's wedding and proposes to her. He sees her text and reaches there in about 3-5 minutes which is not possible since traveling from Mumbai to Chandigarh in a helicopter would take much over an hour.
When Aakash knocks on the bathroom door and tells Reena to come out because he wants to talk, she clearly isn't listening to him as she has earphones. Later after completing her bath she comes out and asks, what he wanted to talk about, which isn't possible since she never heard him.
Also after taking a bath once, she bathes again while singing.
When Aakash eats Pani puri, he eats an empty one. In reality there should be potatoes and tamarind water in it.
At the end, during the wedding the chants of the priest do not match his lip movement.