Newsies/WMG

Jack's real father is Alfred Borden from The Prestige.
Hence the resemblance, their tendency to get incarcerated, and the unbelievable amount of Ho Yay. Borden has been to New York, and he's slept the hell around...

Independence Day is the result of the Alien race seeing this movie and deciding that the current president would only fight back with dance.
That's the reason we won. The alien race expected a dancing pussy. What they got was Bill Pullman. Not one of the Names to Run Away From Really Fast, but still more resistance than they expected.

Jack Kelly grows up to be Batman
His parents are... not here. Maybe they were shot in an alleyway and Jack became an orphan instead of being taken in by Alfed? Or maybe this is part of his Walking the Earth routine where he will learn the stealth, martial arts, and synchronized dance techniques that will allow him to clean up the mean streets of 1920's Gotham?