Dedication
Most of Pynchon's novels contain dedications-- Mason & Dixon ("For Melanie, and for Jackson") , Vineland ("For my mother and father"), and Gravity's Rainbow ("For Richard Farina)-- but not so Against the Day, as published. It is purported that advance reading copies of the book contained some kind of dedication that was omitted from the final publication.

"It's always night, or we wouldn't need light."
Epigraph by Thelonious Monk. Jazz and particularly bebop seem to be a lifelong interest of Pynchon’s, appearing in some form in all his works and what biographical snippets exist. As a college student, Pynchon later “spent a lot of time in jazz clubs, nursing the two-beer minimum,” by his own admission (Slow Learner, Introduction).

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"Now single up all lines!"
The opening line has many possible connotations. The Modern Word's Quail writes that "it is simultaneously a self-directive and a call to the reader; suggesting that Against the Day is a culmination of his previous work, and also charging the reader to find meaning within its twisting labyrinth. It may also be a sly, preemptive joke on the book’s initial critics, as the novel begins with the launch of a bloated gasbag bearing a somewhat provocative name."

The Chums of Chance
Cameraderie and isolation are two recurring topics in Pynchon's works. The Chums are a band of heroes like those commonly featured in the 19th century boys' fiction that Pynchon evokes, but also recall Pynchon's high school fictions, Voice of the Hamster and The Boys, in which the teenage Pynchon lovingly portrayed his group of high school chums, known as, simply, "The Boys."

World's Columbian Exposition
also called The Chicago World's Fair), a World's Fair, was held in the U.S. city of Chicago in 1893, to celebrate the 400th anniversary of Christopher Columbus' discovery of the New World. Chicago bested New York City, Washington, D.C. and St. Louis, Missouri, for the honor of hosting the fair. The fair had a profound effect on architecture, the arts, Chicago's self image and American industrial optimism. Wikipedia entry.

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Pugnax
The name meaning, in Latin, "likes to fight."