The introduction to the Rebel Camp in Whispering Woods is the same shot that was seen in Into Etheria (1985), but played in reverse.
Robert Lamb planned to submit a story elaborating on the history of the First Ones in which the frozen form of a First One was discovered under Frosta's kingdom, but the series came to an end before he could do so.
A different interpretation of The First Ones is part of the backstory for She-Ra and the Princesses of Power (2018), in which they are connected to Eternia.
The animated sequence of Adora holding her sword unsheathed as she begins her transformation into She-Ra was previously used in She-Ra Unchained (1985), Battle for Bright Moon (1985), Friendship (1985) and Horde Prime Takes a Holiday (1985). It will be used again in Book Burning (1985).