In Eternal Darkness (1983) and Jacob and the Widgets (1984), Eternia has only one moon. But in this story, The Shadow of Skeletor (1984) and He Ain't Heavy (1985) there are more than one.
When Teela gets knocked down by the wind on the ledge, it can be seen that the lining of the top of her left boot is red rather than the usual white.
After Teela falls into the pit, she states that she can "feel her mother". However during the first season it is documented that she was adopted by Duncan when she was a baby. Furthermore The Sorceress erased her memory at the end of "Teela's Quest". So either way, Teela shouldn't be aware of her connection to The Sorceress.
When Teela hugs Man-At-Arms towards the end of the episode, Man-At-Arms' helmet briefly flashes orange.
During the "I have the power" part of the transformation, the audio is about a second ahead of the video.