When Catherine and Nick figure out the ricochet bullet at the coffee house, the coffee bags say "100% Columbian." As most people know, much of the world's coffee comes from the country of Colombia, which is spelled with two O's, not an O and a U.
When Warrick found lice on the victim's shirt he said, "Wasn't our dead guy clean?" Any half way decent scientist would know that lice are not only found on dirty people. Personal hygiene has nothing to do with lice.