Jim Belushi is a real life die hard Chicago Cubs fan, who's actually sung "Take Me Out to the Ballgame" on numerous occasions in Wrigley Field in honor of late Cubs announcer, Harry Caray .
J.J. Abrams, who was a writer for this film, makes an appearance as the first passenger on Spencer Barnes' plane towards the beginning of the film (about 16 mins).
The Chicago Cubs, the team playing in the World Series in the film had been in the National League playoffs after filming began on this film. They had lost to the San Francisco Giants in 5 games and they would not return to the World Series until 2016 when they finally won after 108 years.
Production title was "Filofax", but the word is a registered trademark of the Leeds Filofax Group, and producers could not get permission to use it as the movie's release title. This was not a problem in Europe and other countries, where the film was released as "Filofax".