Continuity mistake: Sam and Doug are talking about the President's speech and Doug is holding his notepad, which he shifts to his right hand and starts to put to his side - but the next shot shows it back in his left hand. (00:14:00)
Continuity mistake: When Margaret goes into Leo's office to announce the arrival of Gianelli, he puts his glasses down on a bare portion of the desk. The next shot from behind him shows the glasses lying on top of books/papers. He'd had no time to move them. (00:15:40)
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.