There's those funny/sad stories of how face recognition software has categorised black people as either invisible[1] or gorillas:

http://www.businessinsider.com/google-tags-black-people-as-g...

http://edition.cnn.com/2009/TECH/12/22/hp.webcams/index.html

The prejudice of the programmer (unintentional, as all prejudice really is) can show up in the code just because they forgot to include enough data in their training set.

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[1] In light of which Ralph Ellison's novel is particularly prescient:

https://en.wikipedia.org/wiki/Invisible_Man