A life-long fan of camping, Jeff Daniels has owned an RV for years. According to a Detroit radio interview, his RV driving lessons for the movie were quickly canceled when he arrived on location in his personal recreational vehicle.
Jeff Daniels composed "Recreational Vehicle" song for his charity album "Jeff Daniels Live and Unplugged." The song was about his personal RV misadventures.
Throughout the film, a man's humming is used in the score. According to Barry Sonnenfeld, it is actually supposed to be the voice of God. The humming would appear when something disastrous in the movie would happen.