It's really interesting how the nature of a paper/presentation changes from the beginning to the end. It's so easy to start out with a plan to prove a specific point, and in the process of writing, you end up arguing something else completely. In some ways this could be a good thing, but in a few cases I think it wound up working against the speaker. While trying to write out the thinking process, there ended up being contradictions, and thoughts that disproved the original point.
After the presentations are over, there is enough time to revise the paper, to either steer it in another direction, or to edit out the contradictions. I hope the class provided enough constructive criticism for any possible improvements to be easy to reach.