Usually, tables of contents are built using styles. If you select the entire TOC and then right click and choose to Toggle the Field Code, you can see how your TOC is configured. This will give you a hint as to what styles are being used in the TOC. You can then go through your document and make sure that the paragraphs that SHOULDN'T appear in the TOC are not using that style.

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Andrew Lockton
Chrysalis Design, Melbourne Australia