These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Accidental Aesop: "If you harass someone enough, they'll eventually do what you want them to do just to get you to leave them alone!"
Accidental Innuendo: "Could you, would you, with a goat?", "I would not, could not, with a goat!"
The animated short is popular for Youtube Poop for this very reason.
Alternative Character Interpretation: Is the Guy-Who-Is-Not-Sam-I-Am reluctant to eat the titular dish based on its appearance/color alone, or is his refusal based on his self-proclaimed dislike of Sam-I-Am and the subsequent desire to not give Sam the satisfaction of having got him to do something?
Designated Hero: Sam-I-Am stalks, harasses, and even kidnaps the nameless character because he won't try green eggs and ham. He's vindicated by the end because the nameless character ended up liking them.
Fan Nickname: Sam-I'm-Not for the nameless character Sam-I-Am keeps pestering.
Ho Yay: It's possible to see the book as having a gay subtext. Sam-I-Am is offering something at once familiar and yet with an initially-unappealing aspect to it to Sam-I'm-Not ... like same-sex relations. He is convinced that Sam-I'm-Not really, really, deep down inside likes it and he knows this. Sam-I'm-Not resists this doggedly, which has to make Sam-I-Am even more convinced that he understands Sam-I'm-Not better than he himself does.