The date of Robert Queen's tombstone does not match the date given on the news in the pilot.
The scar on Martin Somers' face does not match where Oliver shot him compared with the scene with the detectives.
Martin Somers cannot be prosecuted on the basis of the confession, because that confession was forced, under duress, and he might have spoken falsely what the hooded vigilante wanted to hear. Any two-bit street lawyer would prove that decidedly in a court of law, let alone the long battery of big shot lawyers of Martin Somers. So, the hush up winding of Martin Somers' case was misconceived.