In an earlier version of the script Cally was forced to take Shadow, which caused her telepathic and telekinetic abilities to manifest erratically.
Jenna mentions being arrested after refusing to smuggle shadow for Largo, possibly referring to her being in Federation custody in The Way Back (1978).
Blake, Jenna and Avon wear matching light material outfits when teleporting down to Zonda. These are not seen again.
Vila's exploits on Space City are the first indication of his fondness for alcohol, which would become more prominent in Seasons 3 and 4.
Orac would later be possessed in Headhunter (1981) without the explosive being triggered, possibly because Muller's android used a different method to the Darkness.