The dress of King Raynor is almost identical to the dress of the man in "The Kiss" by Gustav Klimt.
In Centopia - the animated world - the clothes of the different characters (good guys or bad guys/villains) are inspired by Gustav Klimt's paintings.
As the series changed responsible (producers, directors, etc.) there were also changes in the cast. Rosabell Laurenti Sellers plays Mia in the first two seasons, while Margot Nuccetelli only stars in the third. Mo is voiced by a different actor in each season, namely: Andrew Craig, Evan Stern and Timo Kinzel.