I recently acquired a first Ballantine books edition of The Silmarillion, and was surprised to find that at least two of the points that denote the earlier printings of the hardcover book are present in this paperback. The period after Feanor is missing and the italicized “and” is present (Lord of Waters and King of the Sea) in the Index of Names. Not being too familiar with publishing or printing practices, I wondered if anyone could enlighten me as to why this would be the case given that in subsequent editions of the hardcover, these mistakes were rectified.
Interesting to note that the Unwin paperback edition from the same year, 1979, does have the corrected text.