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.