Watch the scene when Clark explains they are going to Vegas. When they are going to sit down, there is no glass on the table. However, in the first shot of Clark, the glass is right in front of him.

Then, when he goes to eat the whole cookie, he dips into the milk. The next shot shows the cookie in two pieces, one on the table and one in his hand. After that, on the table, the half cookie is to the right of the Vegas pamphlet, and in the next shot it is on the left.