ToBeFrozen's setlist.fm

The original recording of 'Dancing Queen' by Abba was played at the end of the two London shows in Hammersmith (i.e. First Aid Kit weren't singing it!). I don't know for sure about the other UK shows as I wasn't there.

Sorry, I didn't check the merch desk.

Personally I'm against adding the video interlude stuff onto setlists. In my opinion they clutter the setlists up and make them harder to read without adding any relevant or useful information. It's up to the editor's opinion in the end though.