This is the first film where the Chinese government has allowed a fight to be shot on the Great Wall.
The fight on the Great Wall was shot in seven days. It was originally planed to be shot in 20 days but the Chinese government would only allow for seven days for tourism purposes. Those seven days were extremely busy; Akshay Kumar, who usually shoots for only 10 hours a day, had to shoot for 18 hours in chilly conditions on the Wall.
The film was originally titled "Mera Naam Chin Chin Choo" and later "Mad in China."
Akshay Kumar claims that this film is semi-autobiographical: Sidhu is a cook who grew up in Chandni Chowk, Delhi, just like Kumar had.
Akshay Kumar is a big fan of co-star Chia-Hui Liu, having watched Liu's The 36th Chamber of Shaolin (1978) about 100 times.
A song in the film is titled "India Se Aaya Mera Dost." This is a twist on the Bombay to Goa (1972) song "Bombay Se Aaya Mera Dost," which is a favourite song of Bappi Lahiri.
The film's teaser poster (Akshay Kumar in a Chinese robe, carrying a sword-kebab) was designed by Rohan Sippy. Sippy went to Kumar with this poster and said he wanted to make a film with him, centering on this concept. Sippy also developed the fundamental plot from this poster in about three months.
The date on the Opera Night ticket reads "16 January 2009". This is the actual release date of the film.
This film is banned in Nepal for suggesting that Buddha was born in India. Buddha was actually born in Lumbini, which is in Nepal.
It is similar to the comedy movies A Bug's Life (1998) and ¡Three Amigos! (1986), which is about out-of-work actors defending a town while thinking they're merely giving a performance.
It also gives a nod to Akira Kurosawa's Seven Samurai (1954) (as well as its Hollywood remake, The Magnificent Seven (1960)), which is about Japanese villagers hiring a group of swordsmen to fight off rampaging bandits.
The third Bollywood film to be made and distributed in partnership with a major Hollywood studio.
Several shows were cancelled in Nepal due to the protests from students, archeologists, Buddhist monks, researchers, and youth groups. Protests included threats by Buddhists to burn cinemas that screened the film, and racial slurs like "Dhoti" hurled at the Indian embassy in Kathmandu.
The international version has English subtitles for Cantonese dialogues. However the Indian version has omitted the subtitles and retained the Cantonese dialogues as it is.
The film was reported to be inspired from Kung Fu Hustle (2004) where both storylines shows the protagonists bad luck and failures.