Tsubasa Means "Wing" in Japanese
In episode 13 the legend that is the center of the story features a blond haired Princess named Emeraude, a reference to Rayearth's Princess Emeraude.
Of all the characters to make an appearance Aya Hisakawa who plays Kero, is the only original voice actress to reprise her role.
CLAMP artists storyboarded their own opening animation for the second season opening but it was not animated. It would be used later in their animated music video "Clamp in Wonderland 2."
This anime features various characters from CLAMP's manga works, such as Sakura, Syaoran, Touya and Yukito from Cardcaptor Sakura, Yuuko and Mokona from XXXHOLIC, and appearances by characters such as Chi from Chobits