Another post inspired by a forum discussion: A Savage World Deluxe buyer complains his hand cramping after writing down all the errata in the book while another one asked why didn't he print out the errata & tape/glue it in place. This isn't so simple; many errata is written in format 'Replace clause X by clause Y' - it might not fit to page at all.
A great step towards greater usability design of rpg's and other games could easily be applied to errata: just a bunch of chapters that can be printed out and which fit perfectly in the places they are supposed to be in the book - including any background patterns, so the book looks almost like it did before errata. There would be page number in separate header of the errata clip and any instructions if necessary - but usually their place would be obvious.
Smallest errata perhaps shouldn't be this way; if a number in the rules should be 2 and it is 3, if there's any room around it might be easier to fix manually - but it's matter of tastes how a game owner wants to do it.
An example from such cut & glue errata item: