Back when Mom was alive she told me how the days of the week got their name.
-- Riggle (narration) ("Monday")

Importance: This line refers to the myth-like stories that Riggle's mother would make up and then tell through Remote, a character she invented. Because Riggle's mother made up Remote and those stories, Riggle's remembrance and retelling of these stories functions as a form of remembering his mother. The novel thereby demonstrates how storytelling can form and preserve interpersonal bonds, even after a person passes away.

He took me on because if he did he got a monthly check.
-- Riggle (narration) ("Monday")

Importance: In this line of narration, Riggle refers to his uncle Joe, who is his legal guardian. Apparently Joe's main motivation for taking care of Riggle is the fact that Joe receives money from the government to do so. This detail adds to the sense that Riggle has been generally deprived of a stable, loving family life...