Revealing Mistakes: When the Doctor picks up the green egg, it squeaks, revealing it to be a painted balloon.
Revealing Mistake: When Jo and the Doctor are punting the mine car across the green slime, the CSO takes away the bottom of the mine car.
Many of the consoles and displays which make up BOSS appear to have been borrowed from the Moonbase set of UFO.
Fell: Unauthorized persons are not in the interest of the company. (as he protests saving the Doctor and Jo)
Minister: Wretched fellow needs a swift kick on the backside.
(in reference to the Brigadier)
Professor Jones: It's gone too far.
Brigadier Lethbridge-Stewart: Far too far. It's time I paid Global Chemicals a visit.
Cliff Jones [ comforting Jo over Bert's death ]: In the whole history of the world there's never been anybody just like Bert. And there will never be another even if the world lasts for a hundred million centuries.