Jasper Beardly can be seen inside the fridge. This is a reference to the episode Lisa the Simpson when he froze himself to discover the future and became an attraction at the store known as "Frostilicus".
Many of the products within the set are callbacks to previous episodes. These include Powersauce bars, copies of The Springfield Inquisitor, the cereal Krusty-Os, Chef Lonely Heart's Meals For One, to name just a few.
Bumblebee Man can be seen in one of the newspapers. However, he did not made his appearance in the first wave of sets and "Brick Like Me" episode.
The rooftop garden is a reference to the episode "Lisa The Vegetarian" where Apu reveals to Lisa Simpson he is actually a vegan. He comes up to the garden to escape the world or to see a drive in movie for free.
There are also a lot of fan service stickers mention the 'Spider-Pig Musical', '50% more fish eyes' in the sea food restaurants and much more.
This is one of the two current Simpsons sets(excluding the minifigure packs) available as of 2015.