You need to reveal the field code used in the TOC to work out exactly what attributes are being used to populate the TOC.

For instance a field code like this
{TOC \o "1-3"}
tells you that the outline levels are being used to build the TOC and therefore you should check the outline levels of the paragraphs that are going in to the TOC that you don't want.

If your TOC explicitly names the styles, such as...
{TOC \t "Heading 1,1,subhead,2" }
then you edit this list or make sure those styles are not used when you don't want them in the TOC.

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Andrew Lockton
Chrysalis Design, Melbourne Australia