It has a lot of references to Dutch politics etc. But the plot is: Máxima is worried about her husband's speeches. You see him being clumsy and using a lot of 'uuh''s when he talks. Even classes from the nuns in Vught (the best language training programme in the country) didn't work: you see a nun telling a tongue twister (De postkoetskoetsier poest het postkoetsportier), 'now repeat after me your majesty', and the king repeats: 'majesty'. Máxima says it is very important that the doctor will help, after which the doctor says he can work miracles and lists these achievements (references to Dutch politicians). WA let his anger go out by boxing against the 'dram book' a book about dreams for our country that was released on the occasion of the inauguration. Halfway Máxima and the teacher come to the conclusion that the king only sounds spontaneous when he cheers (this is when he dances to the music). So they need to give him a reason to cheer: they try last week's speech of the prime minister as an example. The king comments enviously: 'A bad message, but he does it all from his .... (turns his hand with a talking point written on it)... head'. The teacher tries to make him angry, which is the first time that he doesn't 'uuh' and he gets his confidence back. Before he goes upstairs to deliver his speech the teacher tries to give him confidence and gives his last advice: 'go to the core of your happiness and pretend that you are only talking to me' ... after which WA repeats: hockey girls, hockey girls.
Note that he uses quite some 'uuh's' when he talks in real life. In a television show they edited these 'uuhs' to make him sing/uuh the national anthem. The hockey girls joke is due to him cheering on the hockey field with the Dutch (female) hockey teams during the Olympics, hugging them etc. which caused some criticism in the 90-ties.
This is the best Máxima impersonation I have seen thus far btw, the accent, the tone of voice, the way of speaking, the eyes/ mouth movement comes quite close to reality actually, as does the messy hair.