[Swordmaker]

The third or fourth slide shows “the first airplane flight by the Wright brothers in 1911...” Other than the wrong date and the wrong photo, it was a good slide.

Another error was the photo of a slave auction house dated 1868, three years after the close of the Civil war and five years after the Emancipation Proclamation.

[Charles Martel]

I noticed the date on the “Auction and Negro sales” photo, too - it may not be in error. The building may have just been abandoned and the signs remained unchanged well into Reconstruction.