 CONT: Tim has his left arm in a sling after separating his shoulder  on Tool Time. When he arrives to the show to break Bob Vilas  record, he flattens a little boys toy car with a steamroller. When  he squats down to apologize to the boy, there is no sling on his arm  despite the fact his arm is in the proper position for if there  were, and it remains that way for the rest of this particular scene.