Part of the reason you have a problem with the same man making both of those quotes is that the "faster horse" quote was likely not said by Henry Ford.
This looks great and will come in very useful when presenting visual concepts (keep the audience focused).
One suggestion for future improvement would be auto shape snapping. I assume most will use this with a mouse which can result in squiggly, unsightly lines. A number of iOS note taking apps detect a similar shape and snap to straight lines or perfect circles. Hope that helps and thanks for the app.