Reply To: Body text is pushed to next page because of long footnote, leaving a gap on page

There is no logical single (best, least-worst, satisfactory) solution for this. If your client complains about the large gap, tell him you need to split the footnote to fill it. If the client complains about a split note, show that white gap and let him choose between these two.

I usually try to find an earlier page that was deemed ‘good enough’ but can actually handle either more lines (by reducing the tracking on selected lines) or less (forcing one or more paragraphs one line longer than their natural length). Playing with that might give you enough room to either fix (= that *huge* note will fit on the previous page) or hide (= the gap could be made smaller) the issue.