I received various clues. I opened one present in between other people opening gifts so that it was spaced out.
Yes, it smelled like cumin.
"This is his hair."
"This is his dry cleaning bill - four sweater vests."
Bad Horse (he's still propped up in the corner of my bedroom)
Of course, I'd figured it out after the first present, as most geeks would. But it was so cool, especially since half the people watching were really confused. The final present was of course the DVD, and it has since been watched about a million times. If you go this route, you can add the Dr. Horrible comic trade too!