A blink-and-you-miss-it one. As Hero Boy and Hero Girl are sharing their goodbye hug, the conductor briefly checks his pocket watch and makes an exasperated face that just screams "Get on with it already."
Hero Boy telling the hobo that he's "looking for a girl." The hobo howls with laughter and replies "Ain't we all??"
When the conductor takes off his hat revealing a bald top, thus eliminating any exact likeness to Tom Hanks.