I don't get off on all the anti-Wal-Mart sentiment; they are a corporation, and that's nothing new. If one actually pays attention to the news, that company in particular is making some great changes that other retailers aren't (a great example being that they are phasing out all non-energy saving light bulbs so middle America will have no choice but to adopt), but I think that's really irrelevant to this situation.
What you have here is some idiot sales people who get off on using what little power they have over people to make themselves feel better. They full well see thousands of Disney pictures every week and were just giving you a hard time because they could. I agree with other people in saying go elsewhere. Personally, I've stopped using anything but mail order for pictures - they are much, much cheaper and you can usually get them in 4-5 days.
As to a home photo printer, I would never use that for pictures I wanted to keep permanently. Even the best of them won't stand up nearly as longer as professionally printed photos; and when you really break down the cost (paper, ink, etc.) it's just as cheap to go mail order professional.
AEfx
You know, when I wrote this post, I didn't have any intentions of starting the "Is Walmart good for America?" debate. That never was my intention, and the same problem very easily could have occurred at Target, CVS, Walgreens, or wherever.
Anyway....long story short, Walgreens was able to print my photos without incident. So, the problem was solved. That being said, I am still going in to Walmart tomorrow on principle, because they never informed me about these copyright release forms.