Source: Moviemistakes.com is an Internet website created by Jon Sandys in 1996 and is principally dedicated to the recording of mistakes found in movies and television; it also includes trivia, quotes, hidden DVD Easter Eggs and movie trailers. As of October 2009 it currently lists more than 84,400 mistakes, of which over 7,100 have pictures. It also has over 680 paid members and 11,100 free members.
By 2003 the site was averaging 25,000 hits a day and a record 100,000 hits in December 2003 when an article on mistakes in The Lord of the Rings: Return of the King was posted on Slashdot, crashing the site server. A server upgrade was prompted in January 2005 when a list of the “Top Mistakes of 2004″ was copied by several publications and the site received a record 150,000 hits, again crashing the site.
Source : http://do-while.com/coolest-movie-mistakes/