When Smithers goes into the supply closet, 2 'turrets' from the hit game Portal come out to shoot him, Smithers quickly uses a Portal Gun (also from the game) and portals them away.
This episode marks the second appearance of B.F. Sherwood. B.F. Sherwood also has the longest gap between his first and second appearances of any other recurring character. His second appearance in "How I Wet Your Mother" was 3 shorts and 502 episodes after his first appearance in "Family Therapy."
Dan Castellaneta voices Robin Williams. This is the second time Castellaneta has imitated Williams' voice on the show, the first being Aladdin's Genie in "Mypods and Boomsticks". Coincidentally, Dan Castellaneta was hired to replace Robin Williams as the voice of Genie when Disney's Aladdin movie was turned into an animated series.