some good hints in your video on the usage of listboxes. For a long time now we provide a QlikView Data Profiling app called TIQView which is a set of several applications. There is a free profiling app you could try out here:
Just spotted this video, all good practices for checking out your data once you have it in QlikView.
I've created some objects that can be copied and pasted into any QlikView app that allow some on the fly profiling. An app containing these objects can be downloaded from here:
There is also an associated blog post that describes how the objects in this app have been created.