As Walter Sobchak would say, "Fuckin' amateurs."
The Fargo page contains the trivia item that the Coens like to re-use the name "Gunderson," and to this effect it claims that Bunny Lebowski's maiden name was Gunderson. It says DaFino says "The Gundersons, y'know, wandering daughter job." WRONG! DaFino refers to the KNUDSENS, NOT the Gundersons.
Also, it claims Jerry needs the ransom money to finance a new business venture. I disagree; there is no evidence for this in the movie. Rather, I think the business venture and the kidnapping are both aimed at getting money for some other unidentified reason ("Personal matters, that needn't, ah...")