The song 'Kun faya kun', was shot immediately after some emotional scenes, where Ranbir had long hair. However, for this song, he had short hair and when he entered the sets on the first day of the shoot for this song, no one could recognize him.
Huge crowd of audience got out of the theater believing Jordan died in the end, that was not true, but exactly what was planned in the first place by script writers.
In the scene just before the interval (when Jordan and Heer enter lush green fields on their bike), a shot is taken in which the equipment is visible in the shining back of the mirror of the motorcycle.