No, other than examining the unnamed hidden bookmarks to see where they go. Even then, it might be a bookmark created when you create a Table of Contents. (The names given the hidden bookmarks by a TOC and Cross-Reference have different names, however.)
No.
I had assumed that Word would not create multiple hidden bookmarks for the same material, but was wrong.I just tested.

• If there is already a bookmark created by the TOC, another bookmark is created when you add a Cross-Reference.
• If there is already a bookmark created by a Cross-Reference, another one is created when you add another Cross-Reference to the same item.

Note: Be careful of these hidden bookmarks!
If you want to add something to your text before a heading, go to the end of the paragraph before that heading and make your addition. Do not go to the start of the heading and type and press Enter, even if creating a new heading in the same style. If you do the latter, your text will be included in the bookmark even though not part of the heading. This is even trickier when the hidden bookmark is to text in the middle of a paragraph created by a TOC or a Cross-Reference.

See also: Headings that do not show up in the Navigation Pane or in a Table of Contents (or in Cross-References / Hyperlinks)