Errata is usually submitted using the Errata links in the book. The publisher “Packt Publishing” have an errata link on their website:
I also maintain a curated Errata post here for the book once I receive it from them. (but you can also email me direct using the “Contact page” here on my blog)
Thanks for the support.
There is more spritesheet work in the Appendix, coving a few other tips and tricks. Still not an in depth overview of the editors capabilities though.
Simon (Darkside) Jackson