According to the DVD commentary, Peter Jackson set up and shot his scene himself in New Zealand. It cost US$15,000.
Before the meeting with Mary J. Blige, when Ari is talking at the staff meeting, Mary J. Blige can be seen walking outside the conference room. This can also be considered as a mistake since Blige wasn't there for another hour or so after that.
Drama predicts the future when he tells Turtle that before he gets an office plasma TVs will go the way of the 8 Track, which they did.