Continuity mistake: When Kryten is packing his heads away at the point where he says 'how would the manufacturers sell their latest model?' he is looking forwards. The camera changes angles and he is looking down.
Revealing mistake: You can tell Robert Llewellyn is reading his lines when Kryten receives the computer chip. He is looking much lower than the chip in his hand and it was obviously quite a complicated piece of dialogue to remember.
Continuity mistake: In this episode Kryten has no idea how to operate a bazookoid, yet earlier on in 'Polymorph' he was able to change the settings of one from standard to heat-seek and fire it without a problem.