> Actually, he’d be very unlikely, even with the imagined high tech that I gave him, to be able to control whether the coin came down heads or tails—especially if you provide the coin.

It's funny, Dennett talks about a "coin tossing machine" as a virtual impossibility, but Persi Diaconis actually had one built! It is described in this paper: https://statweb.stanford.edu/~susan/papers/headswithJ.pdf

> Physicists have calculated that if you really want to predict coin flips, you have to know the location of every electron in the visible universe and its gravitational effect on the coin.

This is not really true either. Coin tosses leak a lot of information into the physical world. For example, here is a short paper on trying to predict the outcome of a coin toss by analyzing the sound of the "ping!" it makes: https://cs.stanford.edu/~kach/can-one-hear-the-fate-of-a-coi...