The intended original title was "People Who Fear People"
Maria Pitillo was the original choice for the psychiatrist role, which would of been a reunion with her fellow Partners (1995) cast member Jon Cryer
While casting was consistent for the roles of Zack, Bob, and Stansfield. Mackenzie Astin was the original choice as the 4th single guy in the paranoid group of friends.
In the original pilot script the character of Max Perch was named Louis Finch.
Paget Brewster and Jon Cryer appeared together in Two and a Half Men