1. Poison may affect on swallowing mechanism. While the second person is having it slowly his coffee went to his lungs and died following aspiration
2. The position of the bullet entered into the body should be the opposite direction where's the victim couldn't approach by his hand with the gun
3. Servant because letters are not delivering on Sunday
4. Room with the lions fasting morethan years. Because if it is so they all would be dead fssting.
5. He directly went to the place of murder
6. May be the positions of coins landing on the floor is varies and may be the coin dropped from first floor tally with the place of the body found. As jumping from first floor wouldn't't cause death they may assume so.