The three books that Friday seeks, have the following chants, and Engish meanings:
- 1. (Firsthari) Elda Taluta "The words of awakening"
- 2. (Secondary) Sarkus Sark "The words of true nature"
- 3. (Thirstary) Ark Arkus "The words of the truth"
The Darwin Operating System, and several famous scenes of Hong Kong appear throughout the story.
The tune that Margaret was humming to herself in the flower field in episode 24 is actually the theme song of Madlax, 'Hitomi no Kakera'. (Shards of My Eyes) She also hums part of the song "Cradel"
In Madlax red shoes are important to the past events that happened 12 years ago. "Red shoes" could be a possible link to Noir, since Kirika, the young girl, also wear red shoes. In episode 25 you see that Madlax is also wearing red shoes. Both pairs of red shoes from both series look exactly alike.
There are three important books in the series. The first is named 'Secondary'. The other two are 'Firstary' and 'Thirdary'...