There's so many interesting connections between various episodes in MITM. One of the most famous ones is of course Citizen King's "Better Days" ending both the Pilot and Graudation. One I caught onto the other day connects Humilithon and Waterpark: Dewey dances to Abba songs in both. At first I thought it was the same song, but that's not the case. Malcolm and Reese also dance to Abba in Pearl Harbor. I guess that's a favorite of the Wilkersons. ;D What other connections can you think of between various eps?