Keep in mind that the purpose of the Declaration of Independence was a letter to King George of England, listing all their grievances against him and the reasons they felt they had to declare the colonies "free and independent states." They were justifying their actions.
It could also be considered a last-ditch effort at reconciliation with England. That could be something they would disagree on.
They could also disagree on what acts by England should be included.
I have several copies of the full text of the Declaration around here, as well as some books on it, but I've got to leave the house for a few hours to take my son's stuff to college. I'll try to post more when I get back.
