Barbara asks the Doctor for a sedative for Vicki, but ends up giving her an ordinary aspirin.
After the Doctor and Ian leave the Tardis, a piece of elastic can be scene stretching from Ian's pocket. This is how his pen "vanishes" later in the scene.
When Vicki awakes alone a shadow can be seen moving to the right of her.
When Barbara tries to stop the TARDIS' console from spinning,the edge of the set can briefly be seen on the left side of the screen.
The tie that the Doctor dips into the pool looks completely different from the one he remove from it.
Shortly after Barbara explains aspirin to Vicki, a boom mic is visible in the top left of the screen.
Another boom mic is visible during the conversation between Barbara and Vicki aboard the Tardis.
When Barbara is talking about the bracelet she received from Nero, a shadow (possibly a boom mic) appears on her face.