The interior of Kabul Airport is actually the New Delhi Railway Station, which was being renovated.The sign boards on the door say "Station Master" and "Upper Class Waiting room." In the next scene, below the electronic display board, "Railway Station" and fancy colorful scales are visible.
Fahim tells Lisa that the Afghan people are slaughtering lambs because it's the end of Ramadan. He conflates two different Islamic holidays. Eid Al-Fitr celebrates the end of Ramadan. Eid Al-Adha is the festival of the sacrifice, when Muslims slaughter lambs to eat and distribute to the poor.
Bill Bobs character is promoted half way through the movie. When they first meet he was a Colonel, as seen by his collar device, which is an eagle. Later on in the film he promoted to Brigadier General, this is seen by the single star on his collar.
Throughout the film, Tall Brian shoots with a Canon XL-1 (and later GL-1) camera. Shots of his viewfinder show a 30p HDV (HD video) text module in the upper corner. XL-1 and GL-1 cameras did not shoot in HDV; their highest resolution was 768 x 576.
When Kim meets Geri Taub at her office towards the end, Geri is seen serving a glass of water out of a San Pellegrino bottle. Even though San Pellegrino is an Italian brand of sparkling water, the water seen pouring into the glass is clearly still.