The security company that installed cameras all over Springfield was Orwell Security, Est. 1984.
The last cutaway shows Queen Elizabeth noting how she will miss Ralph [Wiggum] who reminds her of her own son, upon which her son (Charles, Prince of Wales) comes into the room and says "... my cat's breath smells like cat food."; which is the last line of the episode. This is nearly verbatim the same line Ralph Wiggum says as the last line of the episode Lisa's Rival (1994).
It is revealed that Lisa and Bart have blonde hair, despite Marge having blue hair (although it has been gray since she was 17. However, prior to this it was originally blue) and Homer had brown hair prior to being bald.