How to show Users and Nodes in a single view? Using the Flag module I have created a bookmark flag for User and Node entities. Working so far so good, but I cannot create a view that displays both Node and User entities in one view.

How do I do this without having to dump views and hand-create the page in PHP?
One option is to add a user view as a footer to the node view. The footer can be configured to inherit the same contextual filters as the main view.

You can't get joint paging or joint filtering using this approach but it works in some scenarios. 

I've also hacked into the views hooks before and manually created a db join but that is a nightmare to maintain so I wouldn't recommend it.