A railroad car of gold, is all I'm gonna say (it's in the first ep iirc). There are several, loosely-connected plot twists and lurches, that one is the silliest. Bond-worthy.

Brian Ferry did the score which was ... ok.

Yes. I was (literally) checking the Wikipedia episode guide when I saw your reply appear. God alone knows why it was necessary to include a very large number of events which would be implausible in an Indiana Jones movie.

The Wikipedia plot summary doesn't do justice to the train car's unbelievable content  -- it was fake ingots made of compressed coal dust, covered with gold-coloured paint -- the credulous protagonists eventually learn this amazing fact after a lot of violence and running around, by smashing them open. They later realize the whole car is 'made of solid gold' after someone throws one of the fake ingots at it, scratching through the car's paint. But the real valuable cargo is a deed to the Brooklyn Bridge, disguised as a gum wrapper!