That sounds about normal for us too. After we finished Trumpet of the Swan, my children played “swan and Sam Beaver” for several weeks. It seemed to be the only thing they were interested in playing. Their absorption of everything we read and watch is why I am so cautious with what I allow into their minds, eyes, and ears. They are not allowed to watch Spiderman, but somehow my son knows who Spiderman is and what he does.
My children don’t watch many movies, and we don’t have any television channels at all, so the only movies they act out are those they have already seen in the past. They mostly act out books, and I know they’re understanding and comprehending what we’re reading if they can act it out. It’s a form of narration!
As far as clothes being in the toilet paper drawer, I think that is an issue of the habit of orderliness. Dressing up in our house is fine as long as clothes and shoes are put away in their proper place. If things aren’t put away, then the privilege of dressing up gets taken away for a while as a consequence.
I, personally, do not mind the imitation/make-believe as long as it doesn’t interfere with school time or with family time. DH and I are not likely to participate in their re-enactments, and there are times that we just want everyone to be “normal” so that we can have family time.
Hope that all made sense. I had kids hanging off me almost the whole time I was typing that!