Spot what is wrong here in below Picture?

What does this below rebus puzzle mean?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

I am white when I am dirty, and black when I am clean. What am I?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

Find the next number in the sequence

5 12 24 36 ?

What goes up but never comes down?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1