Radcliffe's character Craig can be seen catching incoming prayers falling from above the same way his character did in Harry Potter and the Sorcerers Stone. In the film, he grabs a hold of one of his many descending Hogwarts letters flooding the house.
The character Gail in The Department of Angel Resources, played by Angela Kinsey, once portrayed her namesake Angela in The Office (2005). In that show, Angela was romantically involved with the character Dwight K. Schrute, played by Rainn Wilson.
At about 12 minutes in, an announcement is made via loudspeaker: "Reminder, all departments are responsible for the disposal of their assets." While not credited, this must be the voice of Rainn Wilson. During the announcement, a man picks up a trophy for Most Beautiful Sunset. His clothes bear an uncanny resemblance to an outfit often worn by Dwight K. Schrute.