This is one of the weakest of the series. The author seems to be intent on correcting foreign assumptions, rather than putting forward the funny incongruities. Most of the books are written with much pride and appreciation of the land the authors have often adopted, but they also see the funny side. This book maintains that the Spanish have a good reason for everything, which is that they wish to have fun and when it's not fun they ignore it. It's not really the job of these books to correct the funny things we've noticed about the Spanish but rather to add to the sum of them!
For very funny and well-written editions, with all the facts at the fingertips and the humour to pull off the punch lines, see those on the English, the Swiss, the French and the Italians, for instance.