John Gill Reformed Baptist @doctorgill

And set up over his head his accusation written,.... The Evangelist John calls it a "title", Joh 19:19, and Luke, a "superscription", Luk 23:38, and Mark, the "superscription of his accusation", Mar 15:26, it was what contained the sum and substance of what he was accused, and for which he was condemned, and suffered. The Syriac and Persic versions here render it, "the cause of his death".

Albert Barnes Presbyterian @notesbybarnes

Verse 36. They watched him there. That is, the four soldiers who had crucified him. They watched him lest his friends should come and release him.