Actress Dyan Cannon learned how to drive a 13-gear 30-ton semi-trailer diesel truck for this picture.
Dyan Cannon once said of this movie for publicity for this picture: "These days it's not enough to be able to act. In a crazy romantic chase story like this one, you have to dive in boots and all and cope with the high jumps. Such as learning to drive that great big gorgeous tractor-trailer rig. Those babies have thirteen gears and weigh in at more than thirty tons. We could have faked it, but I wanted to really understand how Madie would feel being in total command of that thing.".
This film was supposed to be a drama. Star Robert Blake felt that the film should be a comedy instead. So the script was rewritten during production to make it funnier.
Though the picture detailed an East-West stateside cross-country trek across America, the movie was filmed entirely in California, in the regions of Stockton and Farmington.
To prepare for their lead roles in the movie, actor Robert Blake and actress Dyan Cannon before principal photography, underwent truck driving training from specialist truckie driving instructor Frank Santhuff at the United States Federal Truck Driving School.