- Harold Lloyd first tested the safety precautions for the clock stunt by dropping a dummy onto the mattress below. The dummy bounced off and plummeted to the street below.
- In 1919 Harold Lloyd was handed what he thought was a prop bomb, which he lit with his cigarette. The bomb turned out to be real. It exploded, blowing off Lloyd's right thumb, index finger, and putting him in the hospital for months. When he recovered, Lloyd went back to making movies, wearing a white glove while on screen to hide his damaged right hand. He did his stunts in "Safety Last" and "Feet First" - dangling from ledges, clocks, and windows - using only eight fingers.
- This film was selected to the National Film Registry, Library of Congress, in 1994.
- Harold Lloyd got the idea for the film when he saw Bill Strother climbing the Brockman Building in Los Angeles as a stunt one day. Lloyd - who had a difficult time watching anyone else performing a dangerous stunt because he had no control over that situation - hid behind a corner, peeking to check on Strother's progress every few moments. After Strother reached the roof, Lloyd went up and introduced himself.
- During the famous clock tower stunt, Lloyd is not as far from the ground as he appears. The building on which he climbs was actually a fake wall constructed on the top of a genuine skyscraper and skillfully photographed to maintain the illusion.
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