There were plenty of physicists reading those posts when they first came out on OB (the most famous name being Scott Aaronson). Some later readers have indeed asserted that there's a problem involving a physically wrong factor of i in the first couple of posts (i.e. that's allegedly not what a half-silvered mirror does to the phase in real life), which I haven't yet corrected because I would need to verify with a trusted physicist that this was correct, and then possibly craft new illustrations instead of using the ones I found online, and this would take up too much time relative to the point that talking about a phase change of -1 instead of i so as to be faithful to real-world mirrors is an essentially trivial quibble which has no effect on any larger points. If anyone else wants to rejigger the illustration or the explanation so that it flows correctly, and get Scott Aaronson or another known trusted physicist to verify it, I'll be happy to accept the correction.

Aside from that, real physicists haven't objected to any of the math, which I'm actually pretty darned proud of considering that I am not a physicist.