Other mistake: When the holographic human version of Weebo leans down towards Philip while he is asleep, the reflection of the woman in Philip's glasses is not reversed; note the hair and the way she tilts her head. (00:42:30)
Continuity mistake: When Weebo creates a holographic human version of herself on the computer, the sticky notes on the computer constantly disappear, reappear, differ, or change position throughout the scene. (00:41:12)
Chosen answer: It was rice and he just simply dumped them on the floor because he knew he wouldn't be needing it after the wedding to throw at the bride and groom because the Professor didn't show up.