Steven mentions that his sister Hayley was giving the coach a Rod Carew in the parking lot. Rod Carew was a Major League Baseball player for the Minnesota Twins and California Angels in the 1970s and 1980s. In addition to being the only major leaguer to ever be born in a train, he was one of the most prolific hitters of his generation. It should be noted that Steve is using R"od Carew" as rhyming slang for "screw".
It is not easy to develop an episode that would leave even the die-hard faithful going "WHAT?!?" for twenty minutes, then tie it all together so brilliantly. GREAT episode. Nice to see Adult Swim got actual HD capability recently.