Solution:

The server girl is left-handed as she serves from the right and needs to hold the tray with her left hand.

Solution:

Bottom one

Solution:

The door hinges are on the opposite side.

Solution:

Person-1

Explanation:
Person-3: Some will say the answer to be person-3 as his body is floating in the water. But the question is do dead bodies float in water?. The answer is yes, but it takes at least 2 to 3 days for a dead body to float. In the starting 1 to 2 days, a dead body sink under the water, thereafter it starts floating. Thus, person-3 is not dead.

Person-2: There is vibration in the water. This makes us sure that person-2 is not dead.

Person-1: If you see closely, he is having a book in his hand and it is in the water. Also, he seems to be in a subconscious state.

So, the answer to this puzzle is Person-1.

Solution:

The number of differences is the same as the number of legs of the spider.

Solution:

Rick wasn't at home. He Parked his car after snow built up on the driveway.

Solution:

The boy who has written answers in his arms.

Solution:

The polar bears live in the north pole and penguins in the south pole.

Solution:

Wristwatches

Most of us must have assumed the answer to be a ring in the wrong finger but that's not the case as it's a normal ring. The error is in the watch. Wristwatches are manufactured with the adjustment pin always on the right side.

Solution:

Check a lipstick mark on the glass of the kitchen.