[link to original on tumblr]
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This made me realize that there's a tritone in "Care of Cell 44." It's the last group of notes in the humming part just before "Feels so good you're coming home soon." One vocal part has a G, and an-other has a C#, which together make a tritone.
In the past, I've written about elements in "Care of Cell 44" that seem to indicate that there's something off about the relationship that's described (I really need to make a post that compiles them because they're all over the place), and that tritone in the vocal parts is something else I can add to the list.