A Floor Plan drawing is not a view of the top plates. You would not see door openings or window openings, for example. It is really a horizontal section cut at an advantageous height, often somewhere above countertop height and below upper cabinet height, for example. Always look at the elevations for high windows not shown on the plan view.
I enjoyed the video. Would have been helpful if information about all the plans needed for home construction were presented, such as electrical, HVAC, plumbing, etc.