They have very little dialogue at the beginning. After every line the boy says there is a description something happening. The character 'Vladimir' says something at the beginning and then something is shown happening. This is used to build up the tension until the character unleashes his secret.
I think it is good because the amount of dialogue in each line suits the age of the audience because it has very short dialogue and it is aimed at entertaining children.
They have used short dialogue to make the scenes smoother, faster, and more interesting. It makes it interesting because it says just enough so that the viewer will understand but also the viewer will want to know more and watch.