Just after Jo disappears from Sir Reginald's room there is a shot of the Doctor with a painted scenery backdrop behind him that depicts a dense woodland directly outside the patio window, however when the Ogrons attack later the outside is revealed as being a large grass garden.
Scott Fredericks (Boaz) looses his cap when he struggles with The Doctor in the study as the attack begins. When outside Scott Fredericks (Boaz) has his cap on.
The operation of the resistance fighters' time modules is inconsistent: in the first episode, the operator is not affected by the time field, while the time-traveller - even at a distance from the machine - is transported into the future. When Jo Grant uses the same module, however, she and the machine are both transported into the future, whereas the characters standing outside the vortex (including the future resistance fighters) are unaffected.
Appears as a shadow on the door just as the Doctor's interrogators leave through it, and then as the controller says 'it's no concern of yours' it passes over the other man's head.