Yes, McMahon's QFT Demystified has lots of erratas... Suddenly, an equation is compatible with $c=1$ units, and in the next line another one appears with a factor $\frac{1}{c^2}$. I am not any more sure if a changed sign is an errata or if I have made a mistake when solving the exercise. But is worth the effort of correcting them, I think it is a fantastic introductory text for non-theoretical physicists, with very simple but illustrating solved problems.
Would this site a good place to open a wiki-question, so that anybody can post the typos he/she finds? Perhaps can anybody put me in the right track of where and how to open something like a blog for that purpose? I ask first here in meta.
(Please notice how 'not-localized' I have made the question: errata for physics books in general...)
EDIT: I have just created this blog: https://mcmahondemystifiederrata.wordpress.com for posting errata, not only in QFT, but also for the other McMahon books (GR, QM and String Theory demystified). I have no idea on how to rule it, if it is visible, etc, it is the first time I create a blog, and I don't want to spend much time on it. I welcome any suggestions and help.
That goes for <link> as well
, which means that<link>
wasn't my original topic of discussion. $\endgroup$