Identify the hidden meaning behind this picture?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What is red and smells like blue paint?

Below rebus represent famous DiCaprio movie. Can you name it?

Spot what is wrong here in below Picture?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

What can you see in the middle of March and April that you can never see in any other month?