A little trick I did while creating my presentation was the way I named files. For instance, when I clicked on “during_btn” in “during_mc”  it would go to and play “during_kf.” By making all these titles the same based on what keyframe it was going to end up playing, it was super easier to punch them in to the code. Before this, my instance names for things were all over the place and I had to double and triple  check everything to make sure if it was named right in order to play.
Another simple trick, but it saved me a lot of time.