Revealing Mistakes: Another wobbly wall appears when the Master and the Doctor struggle in front of the airlock.
Crew Visible: When the Doctor enters the airlock at the end of his spacewalk, a crew member's hand can be seen opening the hatch.
Equipment Visible: The wires holding the Doctor up during his spacewalk are silhouetted against the bright ship in several shots, notably when he first leaves the ship and when he is entering the other airlock.
Revealing Mistake: When the Doctor pounds on the airlock door with the oxygen tank, the wall shakes.
The Master [ on Jo pretending to talk to a dummy of the Doctor ]: Thank you, Miss Grant, we'll let you know.
The Master: In reminiscent mood, are you Doctor? Poor Miss Grant. You have my deepest sympathy.
On the flight deck, the Master, rather appropriately, reads War of the Worlds (1898) by H.G. Wells.