Revealing mistake: When Vyvyan is trying to show off his finger trick there are two mistakes, 1) the fingers are bent the other way (this shows that the hand is fake), 2) when he cuts off the wrong finger there is blood shooting out but you can see the tube of blood right near his wrist.
Visible crew/equipment: When the seriously injured chip is voicing her last words to the carrot, the wire moving her is painfully obvious coming in from the bottom right of the screen. Immediately after that we zoom in on the carrot and can easily see the wire moving it too.
Revealing mistake: When Ftumch hits Saunders, some of Ftumch's red make-up rubs off onto Saunders' face.
Chosen answer: It wasn't referring to anything real, just that the government's bureaucratic naming, The Guardian's mangled spelling or Rick's bad pronounciation resulted in the unlikely word "Footumch" being spoken.
Sierra1 ★