I recently read an
article on the
significance of 420 that gave a few other
meanings to the
number.
In literature, apparently, the time 4:20 is a time for leaving, travelling, etc (Mark Twain), and Salmon Rushdie wrote in "Midnight's Children" that "420 has been, since time immemorial, the number associated with fraud, deception, and trickery."
It should also be noted that 4/20 was Adolf Hitler's birthday, as well as the date of the Columbine High School shootings.
And in the book "Jules et Jim" by Francois Truffaut, there is a line that says "angels always pass by at twenty minutes past the hour... at twenty minutes past and twenty minutes to the hour."