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".
They just keep upping the ante on these Couch Gags, don't they? I'm generally not crazy of using recycled plots (sounds too much like Bart raising bird eggs that turn out to be lizards), but Bart's antics with the pigeon were hilarious.