Throughout the scene on the stairs, beginning at 10:55, the position of the ukulele on Dot's lap changes as many as 6 times with changes of point of view.
At 13:29, the position of Dot's hand on Mrs. Gardner's arm changes.
At 31:54, Dot's right arm changes position.
At 34:06, the position of Dot's hands on her knees change, and the blanket also shifts, going from a quilted square pattern to a swoop line.
At 38:54, Dot's arm drops to the table.
At 2:54, shadow of boom mic is visible across Dot's face.
At 39:38, shadow of boom mic drifts across the wall.