Yes Sir, That's My Baby - S1-E19
Continuity mistake: In the scene in bus station, when Mork is talking to the drunk sleeping person, he's holding a bag, there's a shot of the FBI man, and the next shot of Mork, he's not holding the bag anymore.
Continuity mistake: The third years in this series were first years in series two.
A Case of Overexposure - S5-E8
Continuity mistake: In season one episode 16, Arnold says that him and Willis never met their landlord. In this episode they remember him as Mr Darcy - when they see him they recognise who he is.
Pink Arcade / Life With Feather (pilot) / Pink S.W.A.T. - S1-E2
Continuity mistake: Pink S.W.A.T.: the fly disappears on the magnifying glass before the pink panther smashes it. (04:00:03)