When Jen is with Denholm she is wearing thick tights, when she arrives in the basement and enters her new office, she is in thin tights.
When Jen enters the elevator, you hear the announcement that it is floor 34, but when they show the elevator floor button panel, it only goes up to 31.
Jen rides down to the basement on the elevator, which is the bottom floor. However, when the door opens, there are two buttons next to the elevator (up and down). There should only be one, as it is the bottom floor and passengers cannot go down.
Moss says he bought the new Harry Potter book, but he opens the box to reveal The Philosopher's Stone, which was released in 1997; this episode aired in in February 2006, the newest Harry Potter book at the time would have been The Half Blood Prince.
At the end credits, Snaps are shown from Moss' Amsterdam story at the fair. All the signage at the fair is in English, whereas at a fair in Amsterdam it would have been in Dutch.