Went into another one the next scene and wrote nearly 20,000 words before I switched back to the original I had forgotten the opening scene and was thinking that 20,000 words was too long before revealing that the novel is not single point-of-view.
Then I remembered the opening.
Nevertheless, I went back and slipped in a scene from another point of view. Fudging up reasons to throw in point-of-view scenes in order to establish the pattern works just fine, as long as you manage to conceal the fact. With any luck, by the time you revise, it slips in so smoothly that even you can't remember which the fudged scenes were.