This is getting rather tiresome, but I'll give it one more go.
or--on the other hand--an evenings work for a teenage computer nerd.
Pixar, for example, spends months and millions of dollars to get an animated film right - yet your hypothetical "teenage computer nerd" can perfectly synthesize the voice of Morris, including intonation, pitch, and timbre, and "photoshops" thousands of images to get a motion picture of TM, and also has the mad skillz to perfectly coordinate the facial expression to exactly synch with the words...all in commercial breaks between episodes of Game of Thrones?
I'm going to go out on a limb and guess you do not work in computer animation or video production....
no one has explained why morris had a conversation with a stranger about booze and allowed himself to be
Good point - no one in the history of mankind before has ever struck up a conversation with a stranger in a store. This was a historic event.
"Allowed himself to be filmed" - it's quite evident from the video it was recorded on a surreptitiously held smart phone.
Elvis has left the building.