In the music store, Kevin finds D# on the cosmic key. This is somewhat of a blooper in that, in the music world, D# is almost always referred to as Eb.
Contributed by: Rob Caton
When Karg breaks into Gwildor's lair he declares "find the key.. tear this place apart!"
However, we have already established that Skeletor believes he has the ONLY Cosmic Key and later in the throne room stand-off between He-Man and Skeletor's guards (shortly before they get transported to Earth), he learns of a second one when Evil-Lyn sees Gwildor with a Cosmic Key and turns to Skeletor shouting "it's the Locksmith... the little worm has another key!"
Gwildor's exact line to He-Man and his friends regarding Skeletor believing he has the only Cosmic Key (moments prior to Karg breaking into his lair) is "if he knew i had this prototype."
Therefore, the scene in which Karg breaks into Gwildor's lair should not have been concluded with the line "find the key, tear this place apart" as at the time the scene is set, Skeletor didn't know about the other Key - NOBODY did!
At around 1:09:20, as He Man and company seek refuge from the attack of Skeletor's troops, He Man's sword falls from it's holster as he begins heading up the steps.