In doing the initial pass on Chapter 2, I found some strange things. Many of the index entries were blank, and several figures were also missing (though the frame was sized to contain them).
I checked against the OOo version on Alfresco, and there were blank index entries there, too. I could make a stab at them, but I'm not sure I should, that's not an area I've had experience with and it seems to be more an art than a science.
The missing figures were there in the OOo version, so I copied them and pasted into the LibO version. Each time, the paste resulted in having two copies of the figure. Ctrl-Z to undo the paste left a properly filled figure frame. Very strange!