How did this movie get a PG?

No Sex, Nudity, Violence and no Bad Language. Pretty much covers it.

I've just seen this movie on daytime TV in the UK. It seems OK as shown on Film 4 here. I'm not sure if they cut anything. I've had a quick look at the IMDb's parent advisory for the movie which gives a whole load of detail. So perhaps parents might want to check that out if they are concerned.