The only thing the animation extension is doing is doing a selection of a single value in a single dimension whenever you press NEXT, PREVIOUS or you let it animate stepwise.
So counting and aggregation could be done just like anytime else if you weren't using the extension. Of course the calculations will change for each change of dimension values but according to how the calculation fields are associated with this dimension.
If you calculate totals or totals on a certain level they might not change.
To be more specific you will have to provide some more specific information about what you see as a problem...