In a "real life" shoot I can see the set being moved about and things not being put back as they were, but this is a "model" in a computer ... why should it change?

Then later they change again.

And again !

In the second one there is a note missing, but that's because Mrs Brown has taken it, so that's OK.

But look at the colours on the fridge magnets ... why should they change like that?

I'm sure we could start to deduce something about the way the animation is done, although I'm not sure there would be much value in doing so. There are other "continuity errors" to be found, and while you probably wouldn't see them first time of viewing, I wonder how obvious they might become on repeated viewings.

So there's something going on here, some way that the "set" being used is changed from "shot" to "shot", mimicking what happens in a real-life shoot.

It's unnecessary, but to be honest, I find it rather charming.