Jim Or Dwight?
At first, the producers of The Office wanted John Krasinski to play Dwight. John disagreed and only wanted to play Jim. As we can see in the show, John ended up being cast as Jim.
Surfing The Web
The computers on set were fully functional and were actually connected to the internet. Cast members who were in the background of a scene would surf the web all day, playing games or answering emails to pass the time.