yes, as a matter of fact I can talk about those too:
First, we aren't seeing walkouts OR interactive TV from Verb anymore so who cares?
But in any case the walkouts use the canvas tag. Verb was using the javascript canvas tag to simply copy a video and - presumably - to replace the green screen color with transparency. You can't use a video with alpha channel so you have to copy it to create the same kind of effect. Semi clever, but simple. But possibly rife with problems and that may be why we never see NOTIFIAIR anymore. Rory himself said they had to keep starting from scratch whenever Apple did an update!
The canvas tag is what I used too - in less than 1000 lines. It was pretty good -- not quite as clean as Verbs, and as I said that day it didn't work in all browsers or on all devices, but did on quite a few. The very thing you had said was only being done by Verb. Another thing people thought took millions of lines. What a joke!
As for interactive TV, if you knew how V2 worked you would know that the setup was no different than for a CRM call to action button. You just make the button invisible and tell the user to click on the thing in the video that they want, and have the invisible button follow the thing around. Again the positioning and timing are set up by the user -- to make it appear to be interactive. My demo of that was also around 1000 lines.
Probably could have done both in less than 200 lines each, had I used dbase tables and arrays. Simple Simple SImple stuff.