Visible crew/equipment: When Lister sprays Bob with WD40, The thumb of the person operating Bob's head is seen for a brief second in the top right hand side of the screen. This is visible if you watch the DVD on your PC as this will not be visible on some TVs.
Continuity mistake: Just after Kryten says what point in time he would like to return to, he is looking down and working with the screwdriver. The camera angle changes and he is looking straight forwards with the screwdriver on its side.
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.
Visible crew/equipment: In the medi-bay, when Rimmer says, "How about an anal reading?" a yellow microphone appears above his head. (You can see this if you watch the dvd on your pc, as some tv's can cut off the edge of the picture).
Continuity mistake: When Lister tips his socks onto the floor, he throws the bin behind him, near the bunkbeds. But when he picks them up again, the bin has moved over in front and to the right of him.