The message on the chalkboard in this episode reads "No Giggling".
A "bottle bank" is a British street container for public recyclable bottle collection.
The last illustration of "The Elephant and the Balloon" story is visible through the page Bill Bailey is holding, showing the Elephant celebrating with all his friends.
A "breeze block" is otherwise known as a cement block, a cinder block, or a CMU (concrete masonry unit).
Olivia Colman played a police officer in "Hot Fuzz" with Simon Pegg.