I remember hearing stories like this when I was little. It sent me scavenging for mistakes in all of my required reading books hoping I'd get my five minutes of fame in the local news.
Fifth–grader Kenton Stufflebeam of Allegan, Michigan recently outfoxed the Smithsonian's National Museum of Natural History in Washington. To see what he discovered,
At the Tower of Time, the exhibit referred to the Precambrian Era. The eleven–year–old boy knew that Precambrian did not have "Era" tagged onto the end. Bothered by the mistake the boy left a note on a comment card never expecting to hear back from the world famous museum. Surprisingly, they did write him back telling him he was "spot on" and that the museum was changing the error. Much to the smarty pants chagrin, they misspelled his name and his hometown on the address. Nothing's getting past this eagle-eyed boy!