Intra-frame, inter-frame mode changes

I've been using the term "mode-change" to describe a change in performance strategy. You have some actors. Then a mode change—now the film is being carried by a prop. Another mode change. Now, puppets. That would be an inter-frame mode change. But what about intra-frame mode changes and their consequences. Some examples would be those late 90's Disney movies. Beauty and the Beast dance in a computer-generated ballroom. Or Lion King—2D animation lions in front of a computer-generated stampede. There is naturally a dis-integrative look to these shots. But what specifically are the performance consequences to having both modes performing in different ways in a single shot? Speculations welcome.