This is great that Lucasfilm is identifying this issue. Fourth printing sounds like demand for the book is good, wonder if this is meeting or exceeding expectations. Maybe the RotJ book can gain a few pages because of this.

But I don't understand why Del Rey was even allowed to look at the SEDVDs when producing this book.

But it's great that people like doubleofive who took the time to write to them, got them to identify an issue. and in this case act upon it to correct this 'small'.... situation. Good job!