When Kundan and Murari return from hospital to Kundan's wedding, they are on a 'Piaggio' scooter belonging to Murari. But in the previous traveling scene, both were on a 'Bajaj' scooter belonging to Kundan.
When Kundan stops Zoya's rickshaw near her house and tells her that her parents are getting her married, Zoya's black Bra strip is visible and when she walks inside her home to talk to her mother the bra strip is of some other color.
When Jaspreet (Abhay Deol) proposed to Zoya (Sonam Kaooor) for marriage, he says if she marries him she might get to spend rest of her life at 9 Race Course Road, hinting that he might become the Prime Minister someday. The official address of Indian prime minister is a group of 5 bungalows (1,3,5,7,9) at Race Course Road in New Delhi and bungalow no 5 is the residence of the PM and his/her family. Bungalow 9 is used to accommodate the special protection group (SPG) responsible for prime minister and family's security.
When Kundan exposes the real identity of Jasjeet Singh at the wedding ceremony by showing the Newspaper article; he says that the guy is Hindu. But later on in the scene where Jasjeet'a family is taking him home, all the family members are wearing religious Sikh turbines, also the name Jasjeet Singh clearly depicts that he is Sikh not Hindu.