Spot what is wrong here in below Picture?

What's the only room from which no one can enter or leave

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

A crime was committed at baker street. Ibrahim Dakota who was shot in the stomach was the main suspect. Sherlock questioned the suspect. The conversation started as:
Sherlock: What's your story, Ibrahim?
Ibrahim: I was walking around baker street and suddenly a man from the back shot me. I ran as fast as I could to save my life".
Sherlock: That is enough (and ask the police to arrest him).

Why does Sherlock think he is the murderer?

I taste better than I can smell. Who am I?

In which direction should the missing arrow point?

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?