Factual error: The first time Miranda Priestly arrives in the office, everyone scrambles to make themselves look better. One girl uses her webcam to apply makeup, but the image shown in the computer monitor is as though the monitor is a mirror. Given that she is looking directly at the screen rather than at the webcam itself, her eyes should not be shown looking directly into the monitor, but rather just below (if it is a top-mounted webcam).
Factual error: When discussing the couture shows/designers that Andy will be seeing in Paris, Doug mentions "Nicolas Ghesquiere", the head designer for Balenciaga, a house that doesn't currently show Haute Couture.
Chosen answer: Miranda was going to be replaced by Jaqueline and forced to retire. Miranda worked a deal to give Nigel's new job to Jaqueline instead. Since Jaqueline now has a job she wants, there is no one eager or qualified to replace Miranda. Miranda keeps her job. Nigel doesn't get a new job and must remain with Miranda. Miranda gets what she wants, Jaqueline gets what she wants, Nigel gets screwed, but maintains the (most likely futile) hope that Miranda will pay him back by some other means in due course.
Myridon