Factual error: Lord John Marbury says he is "the Earl of Croy, Marquess of Needham and Dolby and Baronet of Brycey." His title according to the British peerage rules would be "The Earl of Croy" and he would be called Lord Croy in conversation. Lord John Marbury would be what one of his younger sons also named John would be called.
Audio problem: When Bruno unmutes the televisions in the communications office for Sam, you can hear one some of the newscasts looping before the scene ends.
The Indians in the Lobby - S3-E8
Continuity mistake: When Josh is drinking water from a bottle he starts screwing the lid back on as he moves it down towards his desk. In the very next shot, however, not only is the bottle suddenly on the desk without Josh's hands anywhere near it, it also doesn't have its lid on. (00:10:05)
Chosen answer: A really annoying innate lack of sense. My friends and family say the same thing all the time, and I'm endlessly trying to correct them. I think people just don't know any better and (ironically) couldn't care less that they're speaking incorrectly.