SRK seems to be driving for about three seconds, around :02-:05. And he drives in the trailer. But you're right. The rest of the "driving" is artificial. You wouldn't think he would need his glasses to dance. It must be part of the act. SRK has said his vision is so poor he can't recognize people in a crowd who ask him questions, which is why he often wears glasses facing crowds of people. I think "The Star" in "I Hate Love Stories" is mostly a combination of SRK and Salman Khan. They even play some of SRK's songs in parts imitating some of his classic scenes. The girl chasing part is probably Salman, although there are other irresponsible stars as well.