'A curious affair': 1907 Lasker - Marshall

In 'Why Lasker Matters', Soltis' introduction to game 1 of the 1907 Lasker - Marshall match has four historical points worth further investigation...

The world championship match with Frank Marshall was a curious affair. The American had a plus score against Lasker [1]. but almost no one thought he had a chance -- despite Lasker's Chess Magazine's efforts to encourage Marshall's fans [2]. It was a backup event, a replacement for the collapse of Lasker's arrangements to play Tarrasch [3] or Maroczy [4].

...The first point ('[1]') is easy enough: Marshall - Lasker, Paris 1900, 1-0; and Lasker - Marshall, Cambridge Springs 1904, 1/2. As for the other three points, what are the details?