I've seen a number of these shots before. It's not something that Disney has ever denied. In fact, on the 101 Dalmations DVD the openly show examples of it (specifically the Maid Marian/Snow White dance comparison.
There were many times when they were simply running out of budget or time and had to get a scene done. Rather than spend the money or delay the project, you use animation you have already done. This applies to so many fields. As a coder, you don't retype code you've already done every time. You copy paste and then adapt. Disney merely did the same thing.
The real problem, and this occurred a few times on Snow White, was when the animators would trace from the live action reference footage rather than take inspiration from it. Disney tried to keep this from happening as much as possible, but it did still occur occasionally.
Our revels now are ended. These our actors, As I foretold you, were all spirits and Are melted into air, into thin air: And, like the baseless fabric of this vision, The cloud-capp'd towers, the gorgeous palaces, The solemn temples, the great globe itself, Yea, all which it inherit, shall dissolve And, like this insubstantial pageant faded, Leave not a rack behind. We are such stuff As dreams are made on, and our little life Is rounded with a sleep. mycroft16 on Twitter
Well, you did have a team of highly skilled artists who did brilliant and unique animation but if you can reuse bits and pieces without being obvious then why not save a couple bucks? It’s just a method that’s used from time to time, and Disney is not the only studio to do it.
There were many times when they were simply running out of budget or time and had to get a scene done. Rather than spend the money or delay the project, you use animation you have already done.
A perfect example would be the finale scene of Belle and the Prince dancing at the end of the movie. If you listen to the commentary, the directors actually say that they ran out of time and had to "reuse" the animation of Aurora and Philip dancing, and simply traced it as Belle and the Prince. They were very straightforward about it.