Character mistake: In Ch 14, Langdon muses on hatha yoga as an ancient Buddhist art. Yoga originated in the Rig Vedas, an ancient Sanskrit text, and predates Buddhism by around 2,000 years.
Plot hole: The main reason the antimatter bomb was not found, according to the book, is because it is small enough to be hidden anywhere. However, there was a wireless camera watching the bomb all the time. The wireless camera, just like any wireless device, is basically a radio transmitter and receiver, so all they would need is a device displaying the signal strength coming from the camera (having no such device, the CERN could probably borrow some). Where the signal is the strongest, there is the bomb. It is improbable that there wasn't a single person understanding how wireless devices work.