There are plenty of visual jokes in the book - in contrast with minimal amount of dialogue. I love the one above with the "x", "z" and "y" fronts hanging from the washing line (along with the superman suit and the three-breasted bra!). A warm, funny story and a classic book.
There are quite a few articles and biographies on Anthony Browne available online - but I couldn't find an official website by the author. Here is an interview about his life and work: http://www.booktrust.org.uk/books/children/illustrators/interviews/69 and the Wikipedia entry is good for listing his large catalogue of picture books: http://en.wikipedia.org/wiki/Anthony_Browne_(author)