- Please keep these annotations SPOILER-FREE by not revealing information from later pages in the novel.
Page numbers refer to editions with 369 pages, where the story begins on page 1. Not sure if there are other editions with variant pagination. Please let us know otherwise.
Jurgensen's was an upscale, gourmet grocery store with locations in Beverly Hills, Pasadena, and throughout greater LA.
Hokusai's famous Great Wave off Kanagawa
a famous woodblock print. Wikipedia
As the surf band that makes it big, the Boards suggest the Beach Boys. Pynchon himself once visited the home of Brian Wilson in Beverly Hills. See Pynchon and Brian Wilson. Perhaps this chapter drew some inspiration from that visit?
Dark Shadows. . . The Collins family . . . parallel time
Dark Shadows was an innovative TV show in the late 1960's and early 70's that focuses on the Collins family. The show included many Gothic elements, including vampires, zombies, and witches. It also played with time travel and parallel universes in which the same character would be played by different actors or the same actor would play different characters.
This paragraph may be a coded reference to Pynchon's own Against the Day and its reception. Against the Day features parallel universes/time (?) and confounded readers nation- (and world-)wide. This interpretation may be a stretch. I dunno. Bleakhaus 22:59, 9 August 2009 (PDT)
Hanon was a 19th-century French piano teacher and composer. He's most famous for developing exercises for piano students.
One of the first electric keyboards/organs used in rock and roll. More here.
George Formby, Jr. performed "Leaning on a Lamppost" (written by Noel Gay) which Herman's Hermits covered. Tyrone Slothrop, protagonist of Gravity's Rainbow is described as "sort of an American George Formby, if you can imagine such a thing."
Donna Lee, way more than Coy's usual 1 or 2 note solos.
Spanish for hug.
third ballet position
Of questionable taste or morality; decadent.
1949 Mercury woodie
The Mod Squad drove a Mercury woodie, either a '49 or '50.
van Houten, Leslie
b. 1949. A former member of Charles Manson's "Family" who was convicted of the murders of Leno and Rosemary LaBianca. She remains imprisoned at the California Institution for Women in Chino, San Bernadino County, California.
esta gente no sabe nada
Spanish for "these people know nothing."
hijo de puta
Spanish for "son of a bitch."
Spanish for "again/one more time."
What Doc means is "le coup de foudre," aka "bolt of lightning." This echos Reef's 'rounder Italian'; "Say surly topple!" he would scream..." (page 889) from Against the Day.
The English meaning, if it has one, and the explanation for Clancy Charlock's response to Doc, is unclear. It may perhaps refer to the childish fear of being infected by a sort of imaginary germ borne by the opposite sex and known as "cooties," which - possibly - makes a member of the opposite sex whom you touch "cootie food." This seems a bit of stretch.
The phrase is apparently used - at least in the South, and not commonly - to refer to unappetizing or unclean food.
Now, Voyager (1942)
from Wikipedia: Now, Voyager is a 1942 American drama film directed by Irving Rapper. The screenplay by Casey Robinson is based on the 1941 novel of the same name by Olive Higgins Prouty, who borrowed her title from a line in the Walt Whitman poem "The Untold Want," which reads in its entirety, "The untold want by life and land ne'er granted, / Now voyager sail thou forth to seek and find." Bette Davis' portrayal garnered her an Academy Award nomination, and the film continues to be popular not only due to its star power but also the "emotional crescendos" engendered in the storyline.
The film includes the line: "Oh, Jerry, don't let's ask for the moon... we have the stars."
Zubin Mehta was the Music Director of the Los Angeles Philharmonic, 1962-1978. 
In billiards, a massé shot is when a player strikes a ball with the cue at a sharp angle and causes the ball to curve drastically or even eventually reverse direction. Here's an example. Some pool halls (like this one) forbid this kind of shot because it often leads to scratching or tearing of the felt.