When the two waitresses first arrive at the office, they are wearing make-up. In the next scene, when Michael Scott offers his date the bike, both girls are no longer wearing any make-up.
Creed is shown in the opening scene when Dwight brings a dead goose into the office and they are discussing whether to eat it. After the intro, Creed is seen walking into the office, presumably for the first time, and taking a toy from the toy drive box.
When Michael is lying by Pam's desk, there's a direct shot of him repositioning his legs. In the next shot, his legs are back to the way they were before.
In the photo of Carol's family on their ski trip, she mentions that the trip was "two years ago," placing it at 2004 / 2005. The snowboard that Carol's son is holding is a 2007 model Burton Custom, which was the current model year when the episode aired.
There is actually no Benihana in Scranton, PA. The closest one is in either Plymouth Meeting, PA or Short Hills, NJ, both about the same distance away.
The waitresses that were at the restaurant are not the same ones that came back to the office with Andy, Dwight, and Michael.
The "missing" cable for the karaoke machine is an IEC cable, which could be found on the back of any computer monitor or any computer desktop.