When Man-E-Faces, disguised as Beast Man, meets with the Evil Warriors, Trap Jaw's mechanical arm is on the wrong side (his left) in both his close up and in the extreme wide shot, then switches to the right side (his right) for one close-up and back to the left for another wide shot.
In Eternal Darkness (1983) and Jacob and the Widgets (1984), Eternia has only one moon. But in this story, Into the Abyss (1984) and He Ain't Heavy (1985) there are more than one.
Orko is missing his ears when he claps his hands after Prince Adam's first transformation in to He-Man.
Adam almost has to transform into He-Man in front of Teela, and Man-at-Arms expresses his concern that Teela will find out Adam/He-Man's secret. But Ram Man and Man-E-Faces are also there in the same room and nothing is mentioned, or concern expressed about them finding out.