An early conflict could be Tom having to paint the fence. He resolves his dilemma by making it appear to be fun to the rest of the neighborhood and actually gets the other kids to do the work for him!
A middle conflict deals with witnessing the murder of Dr. Robinson in the graveyard. Muff Potter gets blamed, but both Huck and Tom know that Injun Joe is the real killer. The conflict is resolved when Tom reveals what he saw on the witness stand.
A later conflict could be when Tom and Becky are lost in the cave. They eventually find their way out, but not before running into Injun Joe who has been hiding out there! Joe accidentally gets sealed inside the cave and dies of starvation. Both Huck and Tom get a share of Joe's hoard that was hidden in the cavern.