Steps to reproduce the problem:

1. go to Pages
2. publish travel
3. edit the page
4. add a component to the main area
5. go back to Pages
6. click 'Compare to previous version'
7. the diff is completely broken

Steps to fix the problem:

The broken diff view can be resolved by changing how component variants are composed on travel home. Delete the Featured Tours by Tour Type component and make it a variant of Tour Type Teaser Row:

1. Delete component 01 in the main area.
2. In component 00, change variant-1's template to Featured Tours (by TourType) and set variant audience to Cookie: Tour type = any value. NoSuchDefinitionException error is thrown when you try to change the variant's template to Featured Tours (by TourType). This needs to be fixed.
3. Verify that the page layout still works.

Caveat: The proposed solution fixes the problem on travel demo home page. It does not prevent a customer from potentially composing the same problematic component scenario on their own site.