As much as I love my Parks and Recreation with its smart "dealing with the public" humor, I couldn't help but notice in this week's episode when they go to the library, the circ clerk swipes a supposed library card with a magnetic strip through one of the DVD unlocking/locking mechanisms -- which is not a card reader.
In fact, most library cards that I've encountered all use barcodes and not magnetic strips, and would need a barcode scanner (though my very first card, which I still have somewhere, was printed on cardstock and had a metal plate in it). In the closing credits, the show thanks LA County Public Library, since I assume they taped the library scene there instead of building a set, but none of the library staffers showed them how the desk equipment actually worked? Look at me being all nit-picky!
The library scene fun starts around 7:58: