The part where Andy says he thinks Leslie may have 'network connectivity problems' was completely improvised by Chris Pratt and considered by writer Greg Daniels to be the funniest line in the whole show.
During the filming of this episode Amy Poehler was pregnant. If you look closely in some scenes you can see her bump. The bump was mostly cleverly hidden with camera tricks and darker clothing.
Ben compares Leslie to a flu-ridden Michael Jordan at the NBA Finals. Michael Jordan more likely had food poisoning and not the flu when playing in the 1997 Finals.