Harold Lloyd has to climb a tall building as a publicity stunt

When a store clerk organizes a contest to climb the outside of a tall building, circumstances force him to make the perilous climb himself.

In this short documentary produced for the Criterion Collection, Oscar-winning visual-effects expert Craig Barron and film writer John Bengtson, author of Silent Visions, discuss the unique stunts, locations, and effects seen in Harold Lloyd's comedy masterpiece Safety Last! (1923).