what darkly comic elements does Twain use in chapter 29

I would think that after the Duke and King try to swindle the poor daughters of the family, Huck learns that there are two men who claim to be the real Harvey and William Wilks.

An element seen is the event where both pairs of Wilks 'brother' try to prove themselves to be real that it leads to deciding what tatoo the deceased brother has. Funny thing is that the dresser of the body said the body had No tatoo. The morbidity comes when they have to dig out the body from the cemetery.