Inconsistencies

[Galin]

We might suggest something similar with respect to some of the runes in The Hobbit too -- considered to 'really' represent internal runes. This is noted in Tolkien's Legendarium (in an essay about runes by Arden Smith), as one possible explanation:

'This is supported by Tolkien's statement in the foreword to the 1966 third edition of The Hobbit: '[The Dwarves] runes are in this book represented by English runes'

As for Gimli's remark -- Tolkien didn't forget about Parth Galen, Gimli did