There are 10 clues scattered about the main floor of the golden saucer.

3 are red herrings individually they seem important, but together they contradict each other.
1 seems to be useless unless you think outside the box.
5 clues tell you who, what, when, why and how by unlocking new dialogue choices.
1 seems useless but clarifies the why once everything else is done.

You only need 6 clues to get the golden ending.