When I look at a contact record, I have absolutely no way of knowing if there are any notes, linked potentials, tasks, etc for the contact without scrolling to the bottom of the page and then clicking to open each of these items.

IMHO there is no need to hide the notes, calls, tasks, etc behind another menu.  Scrolling on the phone is fast and I can swipe up and down much more quickly than clicking on 5 or 6 different items to see if anything is inside.  

Just integrate the "Related Information" into the main screen.  You might also consider placing it above some of the other less used information such as Birthday, Assistant, Add to Quickbooks, etc.