When it was released, it became Bollywood's highest grossing film ever. (In March 2023, it had been surpassed by newer films, and was number 8.)
Costumes worn by Aamir Khan in the movie are actually collected randomly from the public.
The Supreme Court of India rejected the plea made by some Hindu Groups to ban PK by stating, "Do not waste the valuable time of the Court by applying stupid logic".
Aamir Khan got nude for the first time in his career for this film.
Movie's satellite rights were sold for a whopping 85 crs. with a promise that the movie will earn atleast 300 crs. nett domestically. This is the highest satellite amount for any Bollywood film.