Chapter 1: Section 7: Page 63: Lines 145-146 (1127-1128)

 "I could've been in the chapel at that dance where the fire broke out. Guess you saved my fundament, there."

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"the chapel at that dance where the fire broke out"
The Northern Ohio Insane Asylum has been painted as Hell and the fire which broke out began in the one possibly holy place in the entire complex. A chaotic reaction of evil against the holy trying to purify it.
    Roswell points out that he "could've" been in the chapel but wasn't. Probably because he's cynical. He's merely reacting as anybody might react when they've fled a dangerous situation: "It could have been worse. I could have died. I was just lucky enough to be where I was in the midst of the danger." But we all know Roswell never actually would have been in the chapel.

"saved my fundament"
Literally, "You saved my ass." But the word "fundament" is probably meant to make the reader think of fundamentalist religions, just to keep the "Insane Asylum as Hell" and "Saloon as Church" analogy going. Merle not only saved his ass but the continuation of his belief system.

Chapter 1: Section 7: Page 63: Line 144 (1126)

 "What a hell of a night," Roswell said.

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Just more evidence of the subtext in the previous line. Roswell describes the actions of the night as "a hell of a night" meaning it was crazy and exciting. But this can also be literal in that Roswell escaped from Hell, an insane asylum where he was held prisoner for his sins and which was, as they escaped, covered in flames.

Chapter 1: Section 5: Page 41: Line 127 (709)

 The soles of Lew's feet began to ache, as if wanting to be taken all the way to the center of the Earth.

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This sentence is probably supposed to make you think of Lew going to Hell. It references Lew's "soul" with a homonym and the center of the Earth where Hell is figuratively located. It's also possible Drave's admittance that he "can't speak for God" was an indication that he's definitely the devil. So now I'm wavering back toward Lew being in The Twilight Zone over Lew having succumbed to the Scientologists.
    I suppose it can be both because art is hilariously subjective! Especially when the audience knows the author will never proclaim their intent! Good move, Pynchon!

Chapter 1: Section 5: Page 41: Line 121 (703)

 Through the winter, though it seemed like any Chicago winter, that is a sub-zero-degrees version of Hell, Lew lived as economically as possible, watching his bank account dwindle toward nothing, haunted both sleeping and waking by unusually vivid reveries of Troth, all stricken with a tenderness he had never noticed in their actual life together.

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"a sub-zero-degrees version of Hell"
This might be a suggestion that Drave is the devil and Lew is in Hell made-up to look like Chicago, which is why he didn't recognize the neighborhood and the hotel he's staying at is so chaotic and the bellhop is a demon. Probably. "Hershel" means "deer" in Yiddish and that starts with "D-E" which rhymes with "D-E" and that stands for "DEMON."

"a tenderness he had never noticed in their actual life together"
Because the Troth haunting Lew was the objectified Troth he put on a pedestal in his imagination. Obviously a made-up phantom of a real person, whose agency relies on the person conjuring up that specter, would be a much better version of the real person. Unless the person with the vivid imagination also suffered from some clinical self-loathing.
    More metaphorically, the "Troth" we make up in our own head is always more sympathetic to our own desires and needs. Actual "Troth" isn't beautiful or pretty or swayed by our desires; it simply is. So Lew was haunted by truth of his past but it was a truth through his own distorted lens. That's something we call nostalgia.

Chapter 1: Section 4: Page 28: Line 50 (422)

 "Heaven, hell," cackled Merle Rideout.

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That is a clever sentence, correct? Sometimes Pynchon will write a sentence which feels like he came up with it to win a bet.

"What's the shortest sentence you can write that involves both heaven and hell?" posited the WASTE employee dropping off a package.
    "Oy, that's an easy one!" cackled Pynchon in a terrible Australian accent that sounded more like Dick Van Dyke's Cockney accent from Mary Poppins.

Chapter 1: Section 3: Page 23: Line 29 (314)

 "Scientific exhibit here boys, latest improvements to the hypodermic syringe and its many uses!"

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I knew drugs were one of the Deadly Sins! If doing drugs is a sin that automatically damns you to Hell, what would the punishment for it in Hell be? Not getting to do drugs for eternity? Or doing too many drugs for eternity? Basically if you end any punishment with "for eternity," I'm totally up for it. Because at least that means I still exist! Unless the punishment is "not existing for eternity." But then I'm already prepared for that one! Even if the punishment is having your entrails pulled out of your anus by demon hands covered in stinging nettles for all eternity, I'd be pretty psyched about my ego continuing on. Good luck getting me down, Satan, when you're letting my ego continue on forever! The only way you can punish me in that case is by destroying my ego! And that wouldn't be all that bad anyway because, as I said, I'm already expecting that and, well, it would put an end to all those stinging nettles in my butthole.

Lindsay is probably right to be suspicious of the intent of some of these exhibits since I think the only reason hypodermic syringes existed in 1893 were to get morphine into the bloodstream.