This page-by-page annotation is organized by sections, as delineated by the seven squares (sprockets) which separate each section. The page numbers for this page-by-page annotation are for the original Viking edition (760 pages). Editions by other publishers vary in pagination the newer Penguin editions are 776 pages; the Bantam edition is 886 pages.
Contributors: Please use a 760-page edition (either the original Viking edition with the orange cover or the Penguin USA edition with the blue cover and rocket diagram there are plenty on Ebay for around $10) or search the Google edition for the correct page number. Readers: To calculate the Bantam edition use this formula: Bantam page # x 1.165. Before p.50 it's about a page earlier; as you get later in the book, add a page.
Finally, profound thanks to Prof. Don Larsson for providing the foundation for this page-by-page annotation.
Amanita muscaria, commonly known as the fly agaric, is a poisonous and psychoactive basidiomycete fungus, one of many in the genus Amanita. Native throughout the temperate and boreal regions of the Northern Hemisphere, Amanita muscaria has been unintentionally introduced to many countries in the Southern Hemisphere, generally as a symbiont with pine plantations, and is now a true cosmopolitan species. It associates with various deciduous and coniferous trees. The quintessential toadstool, it is a large white-gilled, white-spotted, usually deep red mushroom, one of the most recognizable and widely encountered in popular culture. 
The name destroying angel applies to several similar, closely related species of deadly all-white mushrooms in the genus Amanita. They are Amanita bisporigera and A. ocreata in eastern and western North America, and A. virosa in Europe... Closely related to the death cap (A. phalloides), they are among the most toxic known mushrooms, containing amatoxins as death caps do. 
Dispossessed elves run around up on the roof, gibbering
Appears Osbie is already tripping quite a bit here.
Huntley & Palmers biscuit tin
Huntley & Palmers was a British firm of biscuit makers originally based in Reading, Berkshire. The company created one of the world's first global brands and ran what was once the world’s largest biscuit factory. Over the years, the company was also known as J. Huntley & Son and Huntley & Palmer. 
French brand of rolling papers.
Harvey Nichols, founded in 1813, is an upmarket department store chain. Its original store is in London. Founded in 1813 as a linen shop, it sells many international brands of clothing for women and men, fashion accessories, beauty products, wine and food. Harvey Nichols attracts more younger shoppers than its rival Harrods. 
Of a woman: elegant, well-groomed, sophisticated. 
"the Rome-Berlin Axis"
The "Rome-Berlin Axis" became a full military alliance in 1939 under the Pact of Steel, and the Tripartite Pact of 1940 fully integrated the military aims of Germany, Italy, and Japan. 
old fable, fairy tale
The National Socialist Movement in the Netherlands (Dutch: Nationaal-Socialistische Beweging in Nederland, NSB) was a Dutch fascist and later national socialist political party. As a parliamentary party participating in legislative elections, the NSB had some success during the 1930s. It remained the only legal party in the Netherlands during most of the Second World War. 
Wassenaar is in the Netherlands.
98.16 Young Rauhandel
A former friend of Blicero, probably a lover willing to indulge his sado-masochistic tastes. The name literally means "Rough Trade."
98.24 the Ufa-Theatre
Weisenburger’s information on UFA is essentially correct, but he misgives Georg Wilhelm Pabst’s first name as "Rudolf." One curiosity in Pynchon's German film references is the lack of any mention of F.W. Murnau, perhaps the greatest director of that era. His films Nosferatu (the first film version of Dracula) and Faust would seem to be natural allusions for Pynchon to use.
German youth movement promoting a love of nature and the outdoors; see note here
101.1-2 In Hoc Signo Vinces
Latin, "in this sign you will conquer.". According to legend Constantine the Great adopted this Greek phrase, "εν τούτω νίκα", after his vision of a chi and rho on the sky just before the Battle of the Milvian Bridge (312 CE). He had his men paint the chi rho on their sheilds and led them all to victory. Thus did he become the Emperor of Rome and subsequently moved the capital of the empire to Constantinople (formerly Byzas, now Istanbul) and most important for the history of the west -- proclaimed Christianity the official religion of the empire.
In context in GR there are various possible meanings: - The swastika, the broken cross at the mandala's center on the launch pad, the symbol of the Reich, shall win the war and proclaim a new empire -- the Third Reich which was to last a 1000 years -- which, come to think of it, was about as long as Constantinople was the center of the Roman, then Eastern Roman, then Byzantine (but always Christian) Empire (Constantinople falling to the Ottoman Turks in 1459). Common to both Nazi and Constantine rendering is the interplay of the Cross/Swastika over the face of the sun.
- Subsequently, the phrase became the motto of the Sobieski line -- Jan III Sobieski having defeated the Ottomans in 1683 at the Battle of Vienna just outside the city's gates. The phrase has also been used by Irish nobility, the Sacred Military Constantinian Order of Saint George, the Portuguese, the Knights Templars, Freemasons, and the Sigma Chi fraternity.
Which leads to the most amusing reading of the passage: whoever carved the words into the tree did so as a fraternity prank.
Despite the connections with other forms of death-in-life that are referred to throughout Gravity’s Rainbow, White Zombie is the only direct reference to
This contributor would bet a first edition hardcover of Gravity's Rainbow that Pynchon was aware of the "Dumbo". Even I knew it and I know next to nothing about WW II factually.MKOHUT 13:40, 8 July 2007 (PDT)
109.9-11 freak saffrons, streaming indigos
The isolated Dutchman going slowly mad under the southern sun, whose "very perceptions" are changed (and who writes numerous letters to his brother) seems to be a reference to Vincent Van Gogh; the kind of tacit anachronism that Pynchon likes to use in Mason & Dixon.
111.07-09 For as much as they are creatures of God and have the gift of rational discourse, acknowledging that only in his Word is eternal life to be found...
Weisenburger suggests that this is a prayer for new colonial subjects, but the context Frans van der Groov’s hopes for a Conversion of the Dodos suggests that it comes from a discourse on the possibility of salvation or conversion for Jews or others. Given Katje’s problematic relationship to the Holocaust, the passage becomes even more suggestively sinister. The sentence does suggest the views of James (or Jacob) Arminius, the Dutch theologian who broke with the Dutch Reformed Church over issues of predestination and election. Arminius argued that Christ’s salvation was available to all in contrast to the official church's staunch belief in predestination. Frans would extend that grace to dodos as well. Also see note at 555.29.
Beyond the Zero
Un Perm' au Casino Herman Goering
In the Zone
279-295, 295-314, 314-329, 329-336, 336-359, 359-371, 371-383, 383-390, 390-392, 392-397, 397-433, 433-447, 448-456, 457-468, 468-472, 473-482, 482-488, 488-491, 492-505, 505-518, 518-525, 525-532, 532-536, 537-548, 549-557, 557-563, 563-566, 567-577, 577-580, 580-591, 591-610, 610-616