Brad

Question: What was the point of Jamal explaining the cost of pani puri? Did he really not know the answer to the simple question?

Answer: I believe it was to demonstrate that as a "slumdog" he knew some things but not others. He obviously did not know the answer to the question asked on the game show that the police chief asks him about, so to defend himself, he proves that he DOES know some things: just things that not everyone knows.

Brad

Question: Why, at the end of the film, doesn't Jamal simply call Latika on the mobile phone instead of hanging around the station looking desperate the following day? (I assume the following day, since Latika has changed her clothes, although she took no spare clothes with her when she escaped).

Answer: Jamal never had Latika's phone number. The whole reason he found her at the end was because Latika had Salim's phone. Jamal called the number expecting to get Salim, but got Latika instead.

Brad