Audio problem: When Sarah and Professor Brainard are so excited as they are coming home from the Ford guy, the shot is obviously dubbed over (Sarah's mouth doesn't match the words she is saying).
Audio problem: In the end, the guy throws the glass thing, it flies, it bounces, and it falls to the ground. But we never hear it.
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.