apushatayid – you are right, the fluffy slippers will not pose a problem, which is why silliness is not the problem here. The purim story tape adds much of that same type of silliness.
I haven’t seen the lester movie so I cannot bring examples from there, but I know that seeing the portrayal of the subtle things does paint pictures in your mind. Why do you think so many frum yidden believe that the luchos were a single grey stone with arched tops? Or why the Teivah is so often drawn as that boat looking thing with the little shack top. I know I learned inside the chumash that there were 7 of each of the kosher animals, but as a kid I still thought there were two of each, just like the songs and pictures and books always portray.
Those are the types of inaccuracies I, myself, am referring to, and if you spend enough time with kids, you find out that what they hold on to may be very different from what you, as a writer, would have expected. So I try to concern myself with what they will most likely hear, instead of what the writer intended.