UPDATE: Well, whaddya know- I'm an idiot.
Commenter Lampshademan suggested the timing might be a frame rate glitch in the movie file due to the DVD capture. So after trying to find the right combination of software that lets me get accurate frame stepping through a clip from a DVD I was finally able to verify that the scene is basically animated on 2's. All of the drawings, except for the first one of the hold and the last 8 (for the run off screen) are held for two frames each.
Nothing to see here folks. Well, except for a red-faced idiot.
But enjoy the fun animation anyhow.
And I will talk about the change from one drawing to the next because there's some fun stuff going on.