TOC and text flow bug?

Question

I have a TOC that spans about 5 pages (or should).  I've created the TOC and shift click insert it, it then place 2 1/2 pages (about 50% of the total) and then a preflight error is displayed regarding overflow text. Clicking it indicates the problem to be located 2 pages after where the TOC stopped (at only 50% inserted/displayed), and the page in between the last page of the half-placed/displayed TOC and the preflight error message, both are blank.
For example:
Section 1
i - TOC page 1 placed (w/shift click)
ii - TOC page 2 (flowed)
iii - TOC page 3 (flowed, but stopped at half page and only 50% of total TOC)
iv - Blank page
v - Blank page - preflight error messge refers to this page
On a side note: how to see/determine quickly that a page/spread has content? When I trash a page in the Page palette, a confirmation delete message displaying indicating the page has content.
Thx

Answer 1

Regarding:
From my first/intial post:
When I trash a page in the Page palette, a confirmation delete  message displaying indicating the page has content.
And you wrote:
"t's also possible you've got hidden objects on a page you want to  delete, but that usually would be less likely than a page number."
While searching for an explanation of this mysteriously missing last page from my other concurrent post, in opening a previous document version, I saw many additional pages at the end of the section, apprx. 5 addtional - all blank with excpetion to the master number marker and a text frame (which I assume were placed for the multiple repeated TOC inserstions). So I began deleting those (for "fun"), beginning with the last, first, and noticed with each delete by trashcan icon, there was no similar confirmation message as was present higher up in the section when deleting the TOC pages, until the third, forth and fifth from last (intial) pages (as they decrement with each deletion etc.), then the confirmation delete message appeared. I undid the previous deleltions with Cntrl Z, and compared each page looking at the layout etc. (as you suggested), and there is no difference at least visually and object-wise (as displayed) between any of them. So then, why would two (the last two) delete with no content message, and the remaining three have the content message...