Continuity mistake: Frizz and Nug switch colours in a couple of episodes of the show, and Nug has Frizz's glass colour too.
More mistakes in The Dreamstone
Urpgor: Why must I always deliver my creations into the hands of halfwits who can hardly remember their own names?
Trivia: Urpgor falling down a cliffside twice is a reference to the Wile E. Coyote and Road Runner shorts.