Chapter 6

[1]A reference to William Tell. https://en.wikipedia.org/wiki/William_Tell

[2]A reference to Nasu no Yoichi’s feat in the Heikei Monogatari. https://en.wikipedia.org/wiki/Nasu_no_Yoichi

Chapter 8

[3] Ashes is written as (灰) and Charcoal is written as (炭). As you can see, the kanji are pretty similar.