Adora mentions that Glimmer's powers come from a laser jewel in the palm of her hand. This was described in the series bible but is only mentioned once during the entire series.
The visual gag of Hordak blowing steam out of the back of his neck was reused extensively for the character of Brat-A-Rat in Filmation's next series, Ghostbusters (1986).
The sequence of Hordak transforming his arm into a gun-power powered cannon was previously seen in A Talent for Trouble (1985), The Perils of Peekablue (1986) and Sweet Bee's Home (1986).
The statue marked 'Obey' was previously destroyed by Hordak in Into Etheria (1985), He Ain't Heavy (1985) and The Perils of Peekablue (1986).
The shot of a sad looking Adora sitting at a campfire was previously seen in Return of the Sea Hawk (1985).