You can insert a text element into a view or more directly just utilize a comment. See this example - 'Add comments/notes' section to Dashboard?
Table of Contents - Table of Contents Creation to Navigate to Other Dashboards | Tableau Software
For page numbers, it is possilble to add these to print outs but the dynamic sizing of dashboards in a view and the ability to span across multiple pages of a device depending on size make for a challenge in a view. For instance , a Crosstab may only allow 10 rows and 3 columns on a phone but on a pc screen the same view is 12 columns and 40 rows with many more to page down through.
There is an idea with very few votes however - https://community.tableau.com/ideas/3287 - that addresses this request and please feel free to vote it up if this is applicable for your situation.