Revealing: When he sits on the floor in front of Servalan, Jarrier's earring falls off. He fumbles at it briefly, and then the actor breaks character for just a moment, glancing nervously at the camera. When it's apparent there won't be a retake, he goes on with his lines.

Revealing: Blake hands Cally a photo of Docholli, supposedly obtained from Zen. It's a publicity still of the actor that's not only in black & white (how low tech), but Cally has to hold her thumb rather conspicuously over the very 20th Century necktie he's wearing in the photo. You can see a bit of it anyway.

Continuity: The molecularly miniaturized Orac has been hidden in a metal box while Avon & Vila smuggle him into the casino. Back on the ship, Orac returns to his normal size, but the metal case around him doesn't get larger too - it instantly disappears.

Plot hole: To sneak Orac into the Casino, Avon tricks it into reducing its own size by claiming that it is impossible to do so, whereupon Orac immediately shrinks itself to prove otherwise. Knowing in theory that it is possible is one thing, actually doing it immediately without the use of any other equipment is just plain silly. What practical device or physics did Orac use to perform this miracle? There are only two possibilities for shrinking an object to, for example, 1/4 of its size. (1) You can remove 3/4 of the atoms in it. Orac might still be functional doing this but would never be able to be upsized to original size again (since 3/4 of the molecular content is now lost, you'd end up with a "pixelized" version of Orac on re-expansion). (2) You could compress the available atoms into 1/4 of the physical space, which would made it 4 times as dense, and therefore as stable as a nuclear bomb, with a gravitational pull similar to that of a neutron star. Apart from the fact that physics are different for objects of that density and so electricity, for example, wouldn't work anymore: if Orac used this method, its voice would have changed beyond the range of human hearing.