At around 00:22:00 minutes Phantazmo's moustache is missing.
When Scooby-Doo quit the gang and went to live with his parents in It's a Wonderful Scoob (1985), Mumsy and Dada-Doo are two brown great Danes who look like Scooby but with different accessories and they live in suburbia. In this episode they are much older, Dada is of darker shade and Mumsy is grey and they live in deep countryside.