Find 3 differences - a mystery from Stanford University

in photo •  7 years ago 

In 1994, the Stamford University teacher asked students
Find 3 differences. Two differences found all without exception, but the third was able to find
Only one, and finding him, he laughed for a long time with the words: "How did I not notice right away." Dear friend, if you find a third difference, you will also laugh at how incompetent you are.

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Found 2. Give a hint.

I follow you and I thank you for the vote :)