The biblical reference written on the pipe bomb is "Ezekiel 25:17". This is the same passage number from Pulp Fiction, which reads, "And I will execute great vengeance upon them with furious rebukes; and they shall know that I am the Lord, when I shall lay my vengeance upon them."
The book that Trevor's school counselor, Ms Day, gives him is "This Perfect Day" by Ira Levin. It is a science fiction novel about a technocratic dystopia. The book that Trevor gives Ms Day in return appears to be a collection of poems by Pablo Neruda.
All of the horses that Philip instructs to place bets on are the names of "Exotic" (except for Down and Doubt, which is "Legendary") weapons in the popular video game '"Destiny."