Bait and switch applies to advertised sales which this was not. A few people who were in the stores were able to take advantage of a great deal. While I don't think the promotion was handled well I'm not all worked up over it. It's all speculation as to why Disney handled it this way. Bait and switch? Maybe, but I really don't think so.
Bait and switch is not illegal, but is, in fact, rather common. The Target by my house rarely has the items in their Sunday advertisements in stock the first day of the sale. Same thing at the grocery store. Sales, advertised or not, in national chains do not mean that every store will have ample stock of every single sale item. Especially with a last minute unadvertised promotion like the stupid DVD sale.
Did the CMs pressure you into buying higher priced items? When you entered the store were you informed that the DVDs had been on sale, weren't anymore but you felt like you had to buy something just to get out? It's the consumers choice not to spend additional money in the store.
Should I be mad at Old Navy? They were advertising that all their jeans were $20 so I went right away to pick up a couple extra pairs. They were sold out in my size. No one offered me a raincheck, no one pressured me to buy the more expensive pants. I just left a little disappointed that I couldn't get them. The same thing at GapKids this weekend. They advertised that all their kid's shoes were $10 off, but they were sold out of the shoes I had been wanting to get my DS. Did I chastise the employees? No. Am I bummed that I couldn't get the shoes? Yes. Did I spend a bunch of money in the store? No. Will I shop there again? Sure.