When Ed Norton says to Ralph Kramden " you have just reached the first plateau", he is making a reference to the popular game show The 64 Thousand Dollar Question. In another episode, Ralph appears on a thinly disguised version of the game show.
The "dog pound" set is actually the bus depot set redressed.
When Ralph is pitching the idea of an Appetizer to his boss, Mr. Marshall...Marshall calls in two colleagues, Mr. Peck and Mr. Tebbits. Although they're not identified by name when they enter the room...the one who recognizes they might be eating dog food, actually plays Ralph's boss Mr. Monahan, in a later episode, "A Man's Pride".