The Scandinavian 3D Blu-ray entry for How to Train Your Dragon (Blu-ray) has a somewhat contradictory note: “English audio mistakenly listed as ‘Dolby TrueHD 7.1’ on the 3D disc.”
I own this disc set and can confirm that the 3D disc does have a genuine Dolby TrueHD 7.1 audio track, as the package states (genuine meaning that also the rear channels do sound).
Perhaps the Overall should also be updated, as the Scandinavian 3D edition has all the extras, and 7.1 audio, and both 2D and 3D version?
It might also read “DISC ONE (3D Blu-ray)”.