How to ensure Feedback layers do not appear during Review Quiz?

If you enter text in the "Post-Quiz Review" field, SL automatically adds a "Review" layer to the slide. And it will show that layer during a quiz Review, without the need for any triggers. (In Slide View, if you add a layer called "Review" to a question slide, SL will show that during a quiz Review. So that's another way to get that layer.)

By default, that layer uses the "Review Feedback" layout. 

• To change the design, you can either edit that layout in the Feedback Master. You could also apply a blank layout to the layer after it is created.

You can put whatever you want on the Review layer. So for your hotspot question, add whatever you want to indicate where they should have clicked. 

FYI: The Correct and Incorrect banners that appear across the bottom during a Review can't be changed. However, anything put at the bottom of the Review layer will appear on top of them. So if you don't want them to show, just put a solid shape at the bottom of the Review layer.