The big clock is just a prop, and the climbing of tall buildings is done entirely by borrowing.
In addition, I believe that most people didn't notice Harold Lloyd's hand problem after reading it. When making a promotional video for Roach Studio in August 1919, a real bomb was misused in the props, causing him to lose his right thumb and index finger. Therefore, in later movie performances, he wore a special prosthetic glove to cover up.
If you look carefully, you can see that his right thumb hasn't moved.
The inspiration for Jackie Chan in this film is that in "Plan A" he really fell from the clock tower three times.
According to foreign netizens, the movie that first appeared in this kind of high-rise plot should be Roscoe Arbuckle's 1920's "The Life of the Party".
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