Picturing Quantum Processes: typos, omissions and further developments
Typos:

[page 577]: In the definition of evenparity function the values 0 and 1 need to be swapped.

[page 642]: In the two sets of diagrams at the bottom of the page all pi/2 have to be pi. Admittedly, this is a really bad typo, as it is in the summarising chapter.

[page 666]: The triangle on the right in the computation has the wrong twoelement subset, and should have been {1, 4}.

[page 666]: We just repeat the page number for the hell of it...
Improvements:

[computation (5.7) on page 165]: The middle step is not needed since the 3rd equation follows from the 1st by (4.1), just like in the proof of Theorem 5.18. That said, the explicit use of the transpose here is kind of cute.
Omissions:

[page xvii]: Thanks to Marietta Stasinou for pointing out typos in the published version!

[proof of Theorem 5.32 on page 175]: In the last line, the basis is an ONB because of Proposition 5.10.

[Ch. 9, Historical Notes]: In Lafont's 2003 paper Towards an algebra of boolean circuits the structure of a Hopfalgebra also occurred. However, the nodes were in this case no spiders and hence weren't really able to do any milage.

[Ch. 12, Historical Notes]: Brickwork states were introduced and used to establish universality with only XYplane measurements in Broadbent, Fitzsimons and Kashefi's 2009 paper Universal Blind Quantum Computation.
Further developments:

[Sec. 9.4.6]: This section is concerned with where we stood with ZXcalculus, but this is not anymore where we now stand. In fact, ZXcalculus has been completed! This went in a number of steps. First, Completeness of Clifford+T maps was achieved by Jeandel, Perdrix and Vilmart in arXiv:1705.11151. This proof relied on the then known completeness results by Hadzihasanovic for the Z/Wcalculus which we briefly touched upon in sec. 13.3.3. Meanwhile, Hadzihasanovic has shown general completeness of Z/Wcalculus in his DPhil thesis arXiv:1709.08086, and based on that result, Ng and Wang were able in arXiv:1706.09877 to construct an extension of ZXcalculus that is generally complete. Several more completeness result for dimensions higher than two have meanwhile also been produced.
*