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.
Answer: His IMDB entry is at http://uk.imdb.com/name/nm0113055/.
jle