Okay, so that history Imipolex G really confused me. I had to ask my science major roommate to explain a lot of the terms Pynchon threw out there. One of the first things I immediately looked up was the word "aromatic." On page 252, Pynchon writes that the Imipolex G is "an aromatic heterocyclic polymer." I didn't know why a type of plastic would produce a fragrant odor, so I looked it up on the OED. Here it is (shortened considerably, since it was very long):

2. Chem. Epithet of an extensive group of organic compounds, consisting of benzene and its homologues In mod. use, pertaining to or designating a compound with one or more planar conjugated rings of the form typified by the benzene molecule; a group of six pi-electrons in the ring of an aromatic molecule regarded as responsible for its aromaticity.
Called aromatique by Kekulé in 1865 on account of the peculiar and fragrant odours possessed by some of them, especially by certain derivatives of benzene, such as benzoic acid, bitter almond oil, &c.

I noticed a lot of parallels and references to previous events in the book. The description of cards as "pierced frail as sugar faces, frail as the last German walls standing without support" (254) brought the image of the crystal palace (in the beginning of the novel) to mind and Hilary Bounce's "shit-eating grin" (256) brought back that...um, unusual sex scene.

There's also a scene where Slothrop wonders what freedom is and it is brought up that he's in a pattern, something that has been predetermined (260). Slothrop's paranoia six pages later warns him that "the coincidences are running too close," which for some odd reason, totally made me think of Rosencrantz and Guildenstern Are Dead and the existentialistic/free will vs. fate concepts that were emphasized in that play.