"Mouseholes" for cables can be seen at the base of the TARDIS walls in the final scene, notably when the Doctor is picking up Peri.
Continuity: When the Doctor is climbing through the tunnel to the queen bat, the image is reversed (look for the question marks on his lapel).
Morgus: Miss Timmin, I don't like your tone!
Timmin: I wish I could say that's the only thing about you I don't like.
Sharaz Jek: You think bullets could stop me now? You stinking offal, Morgus. Look at me!
The Doctor: Too late, Peri. Going soon. Time to say goodbye.
Peri: Don't give up! You can't leave me now!
The Doctor: I might regenerate. I don't know. Feels different this time...
(The Doctor has just regenerated)
The Doctor: You were expecting someone else?
Peri: I-- I-- I--
The Doctor: That makes three "I"'s in one breath. Makes you sound a rather egotistical young lady.
Peri: What's happened?
The Doctor: Change, my dear. And it seems not a moment too soon!
Peter Davison has repeatedly joked that his emotional regeneration scene was upstaged by Nicola Bryant's loose fitting outfit, which prominently displayed her cleavage.
All of the Fifth Doctor's companions, including Kamelion, appear in the regeneration sequence, as does the Master.
Final regular appearance of Peter Davison as the Doctor. Colin Baker was the only Doctor in the series' 26-year run to have dialogue in the same episode as his predecessor.