I found that Roger's "monologue" at the end of Part I really very emotional. It wasn't really "sweet", because their "hollywood love" isn't perfect (since it's an affair and everything). Nonetheless, I found Pynchon's writing really wonderful right there.
Now, I have a long long long history with Shakespeare's Hamlet, and it may have gone to my head. However, Slothrop's experiences on the Rivera made me think of Hamlet (eeek). Bloat and Tantivy really resemble Rosencrantz and Guildenstern. They are somewhat amusing, sometimes a bit dopey, and seem very innocent and used. Yet they are trying to get something from Slothrop, and he knows it. Furthermore, everyone calls Slothrop paranoid (implying crazy), which is rather like Hamlet. Like Hamlet, Slothrop knows there is something fishy (octopus, even) about the whole situation.
Disclaimer: And I don't necessarily think that it is significant that one part of the book resembled Hamlet...I'm not trying to make broad connections that have no validity. I was simply reminded of Hamlet.
I am tired right now...I hope that made sense.
I was also really struck by Roger's monologue, particularly this passage:
"Damned Beaver/Jeremy is the War, he is every assertion the fucking War has ever made--that we are meant for work and government, for austerity: and these shall take priority over love, dreams, the spirit, the senses and the other second-class trivia that are found among the idle mindles hours of the day...Damn them, they are wrong. They are insane" (179).
He sounds so desperate-- like he is afraid of the war not only infecting Jessica, but infecting him too, and he must keep himself from being pulled into the insanity. Although I think he loves Jessica, it seems to be a neurotic, unhealthy sort of love; he needs her more for what she symbolizes (beauty and comfort in the midst of war) than for who she actually is.
I don't think you're that far off base. I could also see Katje filling an Ophelia role. Granted, these aren't perfect parallels, but they're not really going to be.