Avon's line "Keep thinking, Blake. That's what you're good at" is an homage to Butch Cassidy and the Sundance Kid (1969).
This is the last episode in which Gan is mentioned.
Thania is the first female Federation officer seen apart from Servalan, and the last until Arlen in Blake (1981).
This is the episode with the longest wait before the appearance of the Liberator crew. It's six minutes, seventeen seconds before we first see the ship. The nearest antecedent is the episode Countdown (1979), which takes 6.06m before revealing the regulars, followed by Sarcophagus (1980) (5'55m) and Sand (1981) (5'13m).