A shot of Lon Chaney walking down stairs was put onto the end to prove the audience that he was not an amputee. It was removed from the 1926 release and the film footage is now lost.
Lon Chaney had both of his lower legs tied back and had to walk on his kneecaps for his role as an amputee. It was so painful he could only have his legs tied back for a few minutes at a time, and his knee muscles sustained permanent damage.
In Blizzard's vision of the future sack of San Francisco, he is seen giving orders to his henchmen standing on his restored legs.
Lichtenstein can clearly be seen mouthing the word "Damn!"