The following FAQ entries may contain spoilers. Only the biggest ones (if any) will be covered with spoiler tags. Spoiler tags are used sparingly in order to make the page more readable.
For detailed information about the amounts and types of (a) sex and nudity, (b) violence and gore, (c) profanity, (d) alcohol, drugs, and smoking, and (e) frightening and intense scenes in this movie, consult the IMDb Parents Guide for this movie. The Parents Guide for The Green Mile can be found at http://www.imdb.com/title/tt0120689/parentalguide.
Yes; this movie is based on the serial novel of the same name. It was written by Stephen King.
Like Alfred Hitchcock, Stephen King occasionally has a cameo in the movies based on his stories, but he does not appear in The Green Mile.
This is not fully explained in either the movie or the novel. Think of it as the physical manifestation of whatever disease or sickness John "sucked" out of those he helped.
Four months after John Coffey's execution, Dean got stabbed in the throat. Years later, Brutal had a heart attack while eating a fish sandwich. Paul's wife was ironically electrocuted in a bus accident.
Because of the accidental "gift" John Coffey transferred to the mouse during Del's execution.
Water, particularly salt water, is a good conductor of electricity. Having the brine-soaked sponge causes the electricity to move in a more efficient line thus killing the prisoner faster. Without the sponge, the body would cook, and death would be much more agonizing.
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