In the "Bed at the classroom" scene, Futaba holds the Poemi's left hand while they're on the bed, but in a close shot, the hand that Futaba is holding is like the hand of an adult woman. In the next shot, she's holding the small Poemi's hand.
Puni-puni Poemi has a tattoo in the left arm that disappears and reappears between shots.
Many of the Poemi's fast lines don't match with her lip movements. In the first part, while she's downing from a rainbow, Poemi says a line but her lips don't move.