As an in-joke, the names of some of the crew members are visible on a few headstones at the graveyard scene near the end of the film.
DIRCAMEO(Frank Coraci): the male nurse who attempts to sedate Michael in the hospital but sedates himself instead.
When Michael visits Ben's office, the water that Ben gives Michael is VOSS sparkling artesian water from Norway.
The futuristic car that Michael Newman drives to his house when he first realizes he is CEO of the Company, is the Cadillac Sixteen, a concept car that was unveiled in 2003.
In the lake scene, Adam Sandler's character reminisces his childhood at Lake Winnipesaukee. Winnipesaukee is approximately 50 miles north of Manchester, New Hampshire; where Sandler grew up.
Panavision Inc. listed this feature as the second official feature to use the Genesis Digital Camera System after Superman Returns. Dean Semler would use this system in his subsequent features Apocalypto and I Now Pronounce You Chuck and Larry.
The film's premise was originated from a joke by writer Steve Koren. It was only upon a suggestion of turning into a feature, by the girlfriend of co-writer 'Mark OKeefe, that the project got started off the ground.
CAMEO('Dolores ORiordan, the lead singer of The Cranberries): the singer who sings "Linger" at the wedding towards the end.
The coin trick that Henry Winkler does in the movie is something he does in real life. During public appearances, he will often do the trick for children.
As of 2010, this is Adam Sandler's highest grossing film at the worldwide box office.
Michael passes on a favor from Mr. Ammer, to which Mr. Ammer replies, "I'll put Swardson on it." Nick Swardson is a friend of Adam Sandler, appearing on Sandler's most recent comedy album, "Shh... Don't Tell" (2004). Swardson is also the Bed, Bath & Beyond Guy who asks Michael to be his friend.
Alan Silvestri was attached as the film's composer, but he left the project in late March 2006 due to "creative differences".
The little girl at the lakeside during young Michael's flashback is Kate Beckinsale's daughter, Lily Mo Sheen.
SPOILER: Christopher Walken's character Morty is revealed to be the angel of death. Mortis is the Latin word for death (and is the basis for such words as mortician, rigor mortis, mortality, etc.)
SPOILER: At Ben's wedding in the future, the Freedom Tower can be seen in the NYC skyline (except there are two towers) where the World Trade Center once stood.
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