Thanks for the tip. However, I've had at least one experience and talked with others who have had a similar experience, where the inlay card came from a Blu-Ray disc and should have been HD, but actually redeemed as SD. We had to have customer service at Vudu.com to upgrade the redemption of the code.
Go to myuv.com/redeem, plug in the code, and click continue. The next screen should tell you if it's hd or not. Only do hd, shop that would be helpful.