All of the 6 directors made a "bargain" with the much revered spirit house at Chulalongkorn University in Bangkok to run laps around the entire campus for each 1 million Baht the film would make at the box office . It went on to gross up to 100 million and the directors stayed true to their oaths. They ran the laps, a few at a time though, as the campus is over 100 acres.
The 6 writers/directors are university friends.
Directors/writers mentioned that some scenes and characters are inspired by a Japanese Manga "Doraemon" which is one of the most timeless and ever-popular Japanese animations among Thai audiences.