When Tod pulls in to pick up Buz, there is no suitcase on the back. When Buz jumps the fence and runs to the car, a suitcase is on the back. It is possible the suitcase was on the seat and Tod put it up while waiting, as it is not strapped down as they drive off on the road.
Several scenes of the start of the boat race show lush vegetation on the banks which there is none along Lake Havasu. The scenes look like stock footage of Lake Eloise at Cypress Gardens, FL.