Spot what is wrong here in below Picture?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

What does it mean?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

There is a family that live in a round house. The two parents go out for a movie and leave a babysitter to watch their son. They come back and the kid was not there. Some one kidnapped him. The maid said she was cleaning in a corner. The cook said he was making pizza. The babysitter said she was getting a board game. Who kidnapped him.

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

Why do you find that most of the buildings are deprived of the 13th floor?