<span class=normal> Chopper sequence<BR><BR><br><p class=clear>&nbsp;</p>Shah Rukhs arrival in a helicopter was shot against blue screen in a studio and this was later composited with crowd shots done separately. In another shot, CG birds were added in the post production stage.<BR><BR><br><p class=clear>&nbsp;</p><amp-img width=1.33 height=1 layout=responsive src=https://images.bollywoodhungama.com/img/feature/09/mar/billubehind5.jpg></amp-img><BR><br><p>&nbsp;</p><span class=normal>