We all make mistakes, and this one provided a learning experience without any apparent aircraft damage. With an increase in interest in flying tailwheel aircraft and a scarcity of instructors with the expertise to teach how to do it, commentary on the video might be helpful. Otherwise the video is only provides entertainment value to most viewers.
The approach seemed to be stabilized, if a bit flat for a J-3. With one exception: the airplane was never anywhere near the centerline of the runway except when going back and forth over it after touchdown. The centerline should be straddled when rolling out on final approach and never let go. Touchdown should be on the centerline, and I don't mean 18 inches left or ten inches to the right of it. That is a fundamental of aircraft control that too many instructors don't emphasize and pilots in general let slip. From an instructor's point of view, the pilot's failure to do this should raise a flag that a student either hasn't yet developed the skill to do so or simply lacks focus.
The J-3 has very good low speed control authority and light tailwheel loading {less mass to accelerate the tail once it starts swinging]. The airplane is very forgiving in directional control, even on a paved surface. The Cub can get pretty far out of kilter and still be recovered if the pilot is paying attention. This pilot wasn't doing that. There was plenty of time for a recovery once the airplane started off runway heading, but this pilot stopped being one and became another passenger well before the airplane left the pavement.
To their credit, the pilot did one thing right. There was a slight right cross wind and the this was corrected for. The airplane touched down aligned with the runway, which of course provides a stable beginning to maintaining directional control on the ground.
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