It's pretty clear to all of us Achewood fans out there what happened in this comic. He read a particular recent achewood comic, and it made him think about this Emily Dickinson poem and how you can parody it. Here's the relevant part of the Achewood:
The alt-text to the xkcd is basically a blatant (but acknowledged!) ripoff of the Achewood comic - and to those of us who read Achewood, it just feels pathetic. Your comic shouldn't be about repeating funny things other comics have discovered, it should be about making your own jokes. Or if you discover a basic rule (like "all poems in X meter can be sung to Y tune") at least apply it to a different poem.
Anyway, the comic itself. Once he had the poem stuck in his head, he decided it was rife with potential for humor. Alas, even if the poem is rife with humor, Randall has failed to tap into it.
The joke is almost incomprehensibly stupid. I mean that literally: I cannot tell where the humor is coming from in this comic. The poem mentions a "carriage," so what if Emily Dickinson, instead of getting in it, threw out the driver like you do in GTA? But...why? Is this comic supposed to be making fun of the poem, or the game? Neither one makes sense. If it's the poem, it's basically the equivalent of reading the first two lines and saying "OK WAIT we're going to do this differently" and throwing out the rest. If it's making fun of the game, one wonders: How? This is what the game would be like if they made an Emily Dickinson version? But why would they do that? The answer is that they would do it so that this one scene could happen, because, hey! she wrote a poem once about a carriage!
This juxtaposition is basically the worst of both worlds: It doesn't tell us anything about either of the things being smashed together, just that he wanted to smash them together somehow. The connection is tenuous, to say the least. And it's made worse by the fact that you know he just read Achewood to get this idea. I am sure Chris Onstad is rolling in his grave.