When Bordin is showing his family their new home, he does a sleight of hand trick with the key. When he does this, all five fingers can be seen on his left hand where he had lost two fingers earlier in the movie.
Only one of them lost the two fingers early on. He wore the glove on stage to hide that his brother still had all 5 fingers at the time. While it would still be an oversight to show, it looked to me to be more of a hint than a goof.
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