They didn't look Pakistani at all to me.
The people in the film did not look Pakistani to me - I am a Northwest Indian (Punjabi) myself - and most of the actors in the film were Dravidian's and looked like this:
http://www.flickr.com/photos/56316055@N02/5540450951/
They didn't actually show proper none-Dravidian Punjabi people like this:
http://www.flickr.com/photos/56316055@N02/5473315273/
http://www.flickr.com/photos/56316055@N02/5540472463/
http://www.flickr.com/photos/56316055@N02/5541047588/
<< If you looked at the actor who played Sajid (Aqib Khan) he looked like a fish out of water next to them, and didn't really look racially the same at all.
I am not trying to be racist or anything but I am just saying, it kind of made the film lose it's authenticity for me to a certain extent..