Carnival of Monsters: | ||
 | ep 1 – | As Jo sneaks across the room to retrieve the "Illustrated London News" (while Major Daly is asleep), you can clearly hear the sound of a pen being dropped in the background. |
| ep 1 – | After the Doctor and Jo are locked up in the cabin, they notice a calendar for "June 1926", telling them that today is Tuesday 4th. Only problem is that 4th June 1926 was a Friday!
[Maybe this was a subtle and clever clue to tell them that they weren't really on Earth??] |
| ep 1 – | When Shirna attempts to impress the officials with a little impromptu tapdance, a cable running from the Scope to the back of the set can be seen on the floor behind her. (It's also visible on a couple of later occasions.) |
| ep 1,2 – | During the cliffhanger, the Doctor leaves the TARDIS door wide open when Jo screams for help, but an instant later, when Vorg's hand lifts the TARDIS out of the hold (and later when the TARDIS is taken out of the Scope entirely) the doors are firmly closed. |
 | ep 3 – | Jo gets stuck in muddy water up to her waist in the marsh, but when they escape back into the Scope circuitry, her trousers are back to being dry and clean. |
| ep 4 – | The Doctor is specifically told that Vorg is in charge of the scope, but clearly wasn't paying attention, as he later asks if Vorg is in charge. |