Hilarious in Hindsight: One of the ways given to recognize a Snark is that it has No Sense of Humor, but the term "snark" has itself come to mean a sarcastic, humorous quip, of just the sort the Snark would detest.
The final illustration◊ ostensibly shows the Bellman ringing his bell to mourn the Baker's passing, but the shadows in the lower-left reveal some sort of claw or beak grabbing someone's hand, while the branches of the tree form the Baker's horrified face. Once you see it, you can't unsee it.
The Bandersnatch, which attacks the Banker and drives him insane in the process. The next time we see him◊, his face and hands have gone black (and his waistcoat white), and he's no longer capable of speaking coherently, just shouting and mumbling while flailing about and grimacing. He's clearly trying to tell the rest of the crew something, but the Bellman just abandons him at that point, leaving him to die alone on the Bandersnatch's island.