There is an inside joke about Pakistani travelers who, once told they are about to land and should fasten their seatbelts decide instead to take their bags from overhead storage, as they would do on a crowded train, preparing to fight their way through a teeming mob of people.
When Kamala talks to her Nani on the roof top, the things flying in the sky are kites. Kite flying was one of the most popular ways to pass time on the Indian subcontinent before the internet arrived.
After they come out of Karachi Airport after the words "Karachi - the City of Lights" is shown, the three big vertical structures seen are the Teen Talwar (Three Swords) monument located in Clifton, Karachi, Sindh, Pakistan.
Paani Poori or Paani Batasha is a popular Indian-Pakistani dish having a very spicy-tart taste. Kamala correctly states this dish is "death" for first-time tasters.
The aerial view of the square when they come out of the Karachi Airport actually shows Bahadurabad Chorangi, Karachi, Pakistan.