The series title in the first season's opening credits ("Hello, World!") is seen through Leonardo Watch's All-Seeing Eyes of God.
In the first season's opening credits ("Hello, World!"), when Leonardo uses his All-Seeing Eyes to look at his sister Michella, series creator Yasuhiro Nightow's name appears on a street sign.
The first season's closing credits ("Sugar Song to Bitter Step") is a dance number by the Libra members and the season's antagonists.