Composer Lalo Schifrin wrote a score that was mostly unused. However instead of hiring another composer after Schifrin left the project the director and/or producers decided to use the temp-track selections written to previous movies by various film composers and these composers got credited instead of Schifrin who went on being uncredited even if some of his work is still in the movie.
Originally released to the public in trailers and previews as The Wedding Party in early 2003, and yet was touted as a remake of The In-Laws (1979). Eventually the film was renamed.
The stolen Soviet submarine could not have appeared in Lake Michigan unnoticed because it would have to pass through several locks on the St Lawrence Seaway to get there.
A submarine would never be able to get into the Great Lakes undetected as Lake St. Clair's deepest point is 27 ft. The conn tower would be showing the entire way of the trip through the lake.
When Steve and Jerry are on the plane to France, the clock next to Jerry reads 7:10. However, in the next shot during the same conversation the clock reads 12:00.