There are corrections that need to be made to some copies of THE RUNES. They apply to pages 16, 20 and 25. They do not affect copies that have a puzzle number (in the lower right corner of the title page) that is 2074 or more.
You will see the details that show whether your copy is affected and the corrections needed, when you reach the forum for the relevant page number.
Solvers who would prefer to make these corrections in advance (perhaps because they are working ahead of the forums) can view them all here:
http://www.simplesite.com/greatpuzzle/8411309