In the scene where Caine climbs up the side of a building in the abandoned Theme Park where Laurie ditched her Kidnappers, a rope David Carradine's stunt double is using to scale the building can be seen in the shot.
David Carradine plays two roles here: his lead, Kwai Chang Caine and Laurie's imaginary friend, who speaks in a different voice, older sounding and with a Southern drawl. When Caine goes meet Laurie, he greets her in the wrong voice, the imaginary friend's who had just exited the scene.