On page 8, the sentence “That’s because from your perspective, she is moving toward one of the mirrors and away from the other.” Should be “That’s because from your perspective, the light is moving toward one of the mirrors and away from the other.”
In the same paragraph on page 8, the last sentence “The pulse from the mirror to Sue’s right takes longer to catch up with her while the pulse from the mirror to the left arrives faster.” should be “The pulse from the mirror to Sue’s left takes longer to catch up with her while the pulse from the mirror to the right arrives faster.”
On page 13 at the bottom, it should be “the brighter side of time-reversibility” (and not “time reversal invariance”).