Law & Order/WMG

The New York Police Department is secretly run by Shane McMahon
This theory comes from a couple of posts on the tv.com message board for the episode "Avatar." The poster's theory about Shane O Mac belongs in Wild Mass Guessing.

Jack McCoy is a Paladin.
His special mount is his motorcycle. His "occasional moral lapses" indicate that even though he's a Paladin, the cynicism of the Law and Order Universe, he's fallen every now and then... but that's what the spell Atonement is for.

Detective Fontana was dirty.
This was implied by the writers -- he seemed to have way too much money -- but never explored.

He could've been a Non-Idle Rich; but given L & O's attitude toward the rich, he would've been dirty anyway.

Perhaps he was dirty in Chicago, and came to New York to dodge Internal Affairs.