After Jerry eats the breakfast, he jumps on the butter knife and the butter hits Tom in the face. In the next shot after the butter hits Tom, the butter is back on the dish. Then in the shot when Jerry watches Tom blowing out steam, the butter us gone. Then when Tom is tearing up the telegram, the silverware, butter, and the grapefruit are all gone. When Jerry digs for the shred that says "even a mouse," the grapefruit and the butter knife are back. Then when Tom loses his temper and attacks Jerry, the grapefruit, butter knife, and the dish that the lemon was on are all gone.
In the opening sequence, Tom is throwing darts at Jerry. He has five darts in his hand, and, after throwing all five, he blindfolds himself and a sixth dart suddenly appears in his hand.
The premise is flawed. There is the possibility of setting conditions to a will, but once Tom got the money, nobody can take it away from him.