Other mistake: When Jules helps Ben set up his Facebook account, she takes his picture etc, but when the final Facebook page is shown, the "no photo" icon is on the page, not the photo that Jules took.
Other mistake: Jules is watching the activity on their website in real time with her staff, over a map of the United States. It's a map that dynamically changes every few moments, with the views stat increasing by a few units per second, and icons of shopping carts popping over the map. That's in close-up, because when Ben arrives and the screen is in the foreground slightly out of focus, the page is static, no new views and no little cart landmarks for the duration of his report. (01:03:20 - 01:03:45)
Other mistake: Setting up Facebook, Jules asks Ben about his favourite music. He starts answering, and unless she typed "Sam Cooke" twice and added De Niro's initial exclamation "Jeez" as a musician, she started typing too early and pressed too many keys - besides, you can tell that Anne Hathaway is just doing 'the thing' people do in movies when they go all jazz-handsy over the keyboard pretending to type. (00:54:25)
Other mistake: In the scene with De Niro answering the early morning phone call from Becky that tells her that Jules' driver is MIA, the alarm clock is turned off - in other parts of the movie you could see the sweep hand's constant motion, absent here. (00:40:45)
Other mistake: Ben randomly picks one of the laptops at the intern table. He does not even know how to turn it on, and hits the space bar because Lewis tap it on his own, but somehow that laptop he chose out of all the others is properly logged in with his credentials, because his own personal email is there waiting to be read. (00:15:00)
