Audio problem: When the high Lister plays the harp, his fingers are out of sync to what is being played. (00:11:30)
Audio problem: When Kryten says 'Excuse me, could I just distract you for a brief second?' his lips are out of sync with the dialogue and continue to move after he has finished speaking. (00:23:35)
Audio problem: When the high Kryten picks up the bomb, the high Cat can be seen to start speaking but no sound is heard. In the next shot, the high Cat is then smiling. (00:13:30)
Quarantine - S5-E4
Audio problem: When Dr. Lanstrom says 'Life without pain has no meaning' Kryten begins to speak but no words are heard before the shot changes. (00:07:10)
Quarantine - S5-E4
Audio problem: When Dr. Lanstrom says hello into the walkie talkie, her lips do not move. (00:08:40)
Quarantine - S5-E4
Audio problem: When Rimmer is talking to Lister, Cat and Kryten in the dress, the Cat says "We thought you'd gone nuts" and the shot cuts to Rimmer where the Cat then says "We were trying to heal you." When the shot is on Rimmer, the Cat's reflection can be seen in the mirror and his mouth doesn't move with the line. (00:21:05)
Answer: It's Queen Victoria, someone any Englishman would recognize, and needed no introduction.