Urban legend:
There was a slip of paper on Walt’s desk that merely had the words “Kurt Russell” written on it. It was “the last thing he wrote.” To this day, no one, especially not Russell, knows what Walt was about to write.
Reality:
This is not exactly true, but there is a core of truth to it. The note actually said:
Ron Miller-
2 Way Down Cellar
2. Kirt [sic] Russell
3. CIA-Mobley

According to Wikipedia, what he actually wrote was “Kirt Russell.” The mystery deepens.
Typo.