The cherry-picker truck used by the Flat Critters to get to Tinka's window was a Ford C-Series cab-over. While this truck was manufactured between 1957 and 1990, the cowl insignia combined with reflectors indicates this is a model made after 1968, five years after this movie takes place.
When Snake and Tinka are dancing and the camera is on Snake, the straps on Tinka's dress are in the right place on her shoulders. When the shot changes to Tinka, the straps are hanging off her shoulders. They keep changing between shots.