When Adam dives across Jennifer to keep her from eating the grape she dropped on the rug he knocks over the bowl of grapes. The shot angle changes and the bowl is both full and upright.
Timmy tries to spoil the Harry Potter series for Russell but Russell is already reading The Deathly Hallows which comes after The Half-Blood Prince, in which the events Timmy "reveals" take place.
In episode 4.12, Russel shows extensive knowledge about Quidditch - the fictional sport from Harry Potter - referring to all books up to the seventh. He would have already known that Dumbledore dies. In this case, Timmy's spoiler of this major plot point should have not upset Russel at all.