Currently, a previewed edit does not display [[WP:NAVPOP]] popups since NAVPOP can't register its mouse event handlers on the dynamically created links. There is a workaround that checks in intervals for the spinner to disappear, and makes navpop reparse the preview. That's rather ugly, and I presume other scripts wanting to react on the preview have the same problem.
I propose adding a simple hook which is called once display of live preview is finished (pretty much exactly like [[User:Js/ajaxPreview]]). Proposed patch attached.
attachment preview.js.patch ignored as obsolete