- The film was not originally called "The National Superman Hancock", but "He Comes Tonight". This script has been tossed in Hollywood for more than 10 years, until it was finally realized and filmed.
- Warner Bros. originally planned to shoot this film, but then it gave up the opportunity, and Sony immediately took over and quickly created the film.
- The scene of the train collision in the film was shot in San Pedro, Canada. The crew cooperated with Pacific Harbor Line to modify the front of the SD18 diesel locomotive, and it became the appearance of the props in the film.
Hancock behind the scenes gags
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Michel: Asshole.
John Hancock: [leans in close to Michel] Call me a asshole one more time.
Michel: Assho...
John Hancock: [launches Michel into the sky; turns to chubby kid] How about you, Thickness?
[chubby kid shakes his head; turns to kid with glasses]
John Hancock: Goggles?
[kid with glasses shakes his head]
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Boy at Bus Stop: [hits Hancock, passed out on bench] Hancock!
John Hancock: [slowly wakes up] What, boy?
Boy at Bus Stop: [points to TV screens] Bad guys.
[pause]
John Hancock: What you want, a cookie? Get the hell out my face.
Boy at Bus Stop: Asshole.
John Hancock: What?
Boy at Bus Stop: You heard me.