Hey Brendon, good finding! (yeah, I know, Seth spotted it before...)

I just want to add a thought: in my humble opinion expectations are as important as context, if not more.

If there were some ads for the "event" or if some info about it had leaked before and spread through word of mouth, the metro station would've been filled by interested people, dead keen on listening to Bell, all over the place.

And even if he didn't play "full quality" (which I assume he cannot do, but let's assume he could), people would have been delighted anyway because they knew that the maestro himself was playing.

Ok, you could argue that this would be another context and that peoples expectations are mainly defined by context. So that depends on your definition of context.

But the fact that I wanted to get over is: never underestimate the expectations of people as a factor for success (which the experiment shows in great detail).

just my 2cents...
have a nice weekend too,
Gabriel