On the very last episode of "Boy Meets World", Corey comes out(on the Matthew's patio) to talk to Mr. Feenie about Topanga not going to college etc. While they are talking watch the Grill in the background, the top of it keeps on going up and going down at different camera angles.
If you would pay attention in the last episode to what Corey's little brother looks like. He just happens to be the same little boy that Corey and Topanga met in the hallway of the dorm for married couples in the episode where they moved in to the dorm for married couples.