72 minutes?

Anyone know how the DVD can possibly have a 72-minute runtime (or an hour and 12 minutes), as it says on the DVD box? The short itself is only 21 or 22 minutes, and the shorts in the special features (including the "Human Behavioural [sic] Case Studies") are 1, 4, 6, and 8 minutes. And the storyboard featurette is another 5 minutes. Altogether, that's only about 45 minutes. Even including the director's commentary, which (if one were to watch the main film again with the commentary) would double the time, that adds another 21 minutes, which is still only 66.

So where do they get 72 minutes from? Are there hidden features I've missed?