This is my most current video of the project which is now fully splined. I think the speed of all the movements is a bit fast and some poses could be held a little longer.
One issue I had was when the wrist control was splined during the part where he holds his head to the next pose. The wrist has the follow control that is able to be keyed, it keys from head to none but causes a jerk when mid way. I finally figured out how to fix it by dragging the keys of Head and None to the same frame in the graph editor the problem disappears. A really simple fix that took me a while to find.
Another issue I had was when turning stepped curves into spline, the wrist of the hand would spin around in a wacky way. I ended up going through the whole thing and fixing the hand at that point. Before I tried to adjust in the graph editor but its a little more straightforward just taking the wrist at each point and fixing it.