Quackenbush, modeled after director Chris Bennett, is used as a frequent background character.
He appears in the CIA blooper reel in "Phantom of the Telethon".
Quackenbush appears in a wedding announcement when Marguerite tires to research the hot tub in "Hot Water" and is also in attendance at Principal Lewis' planned wedding to Ellen Riggs in "The Worst Stan".
In "She Swill Survive", Avery Bullock kicks him out of the CIA inner circle to make room for Stan by using an ejector seat. However, they decide they need to work on the ceiling in the inner circle room.
Francine passes Quackenbush as she tries to catch up with the garbage truck in "The Two Hundred".