In Casual Friday (2009), Toby explains he dropped out of seminary to follow a girl, this may be why he is reluctant to enter the church for Cece's christening.
Zoe Jarman, who plays one of the people from the church young adult ministry going to Mexico, later went on to work with Mindy Kaling (Kelly Kapoor) on her series the Mindy Project. She played Betsey, one of the receptionists.
The radio show featured at the end in Erin's car is A Prairie Home Companion, a long-running public radio show hosted by Garrison Keillor.
At the after-party, Ryan asks in an ominous voice if everybody had their Kool-Aid. This is a reference to the Jim Jone's cult in Jonestown, where over 900 people committed mass suicide by drinking cyanide-laced fruit punch.