The game Bart is playing in his room is Pachinko, a popular game in Japan.
At the beginning when Lisa is reading from her German verb wheel, she says "ich esse" (I eat), "er isst" (he eats), and "wir essen" (we eat) to which homer replies "When? When? Ich bin hungrig" (I am hungry).
The Simpsons' telephone number is 555-3926