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)
Continuity mistake: When Robin Williams puts the flubber into his back pocket to show Sara how it will bounce him back up, you can clearly see a hole in which the flubber escapes. When he falls to the ground and Robin Williams turns over the hole is gone.
Continuity mistake: When Robin Williams first flies his car, he throws an apple straight down, but in the next bit, the apple is going diagonally. Is it a magic swerving apple that the Prof. created?
Continuity mistake: After Phillip falls outside of Sara's window, watch the leaves on the ground. They change positions throughout shots.
Continuity mistake: When the scientist throws the balls out the window, they go diagonally into the sky but then they come back down and hit the men who are standing in the place where they took off from.
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.