I'm not 100% sure, but I've been looking at a couple of other websites to see if it has Spanish subtitles, and it doesn't look good. The subtitles of the UK version seem to be in English for the deaf and hard of hearing, German, Danish, Finnish, Norwegian and Swedish. If someone who actually has the DVD could confirm, I'd be very grateful!
Hi, just browsing and saw your post. If you look on this site there are two which have Spanish language choices, with subtitles as well. They are: Mamma Mia (2008) (Full Dub Sub Ac3 Dol) [DVD] [Region 1] [US import] Mamma Mia (2008) (Ws Dub Sub Ac3 Dol Dts) [Blu-ray] [US import] Hope this helps you.