Okay, so the reason I was babbling about how Watson lies is to explain how, in my novel DIM, I will fix some problems in the canon that I've already pointed out--Watson's marriage, the nonsense explanation that Holmes gives in EMPT for being gone three years, and other difficult cases like SPEC.
I've tried and tried to make "the speckled band" make sense, and it just doesn't, so I'll have to assume that Watson altered some of the tale, perhaps to keep anyone from imitating Dr. Roylott and succeeding in killing someone; thus he might hide the true name of the snake and omit to mention that the clamped bed actually had tall bedposts for the snake to climb up and down, rather than a freely swinging bell-rope. (I got this idea after watching the Speckled Band movie.) So in effect Watson is giving the public the gist of the mystery, but fictionalizing certain details. That's the revisions that I'll have to make to Helen's "Reminiscences," along with some attempt to show more of Watson, instead of leaving him a silent cipher in that chapter.