5: "Ecce homo", "Behold: Man". Mankind at its worst, its weakest, its most rebellious. And at the same time at its best, its most reflective of God, its most obedient. All in Christ.
8: Apparently he was afraid because from their short conversation alone Pilate realized Jesus truly could be the Son of God.
14: John explicitly points us to the Passover. Christ the Passover Lamb of God who takes away the sin of the world.
15: Such a sad and ironic answer by the priests. They choose slavery over freedom, Caesar over Christ. Even though they themselves were hoping for Messiah to free them from the Romans, they didn't want it to be done the way Christ was doing it.
23: His tunic was seamless, and John goes into detail to explain this with two further phrases: it was woven in one piece, from top to bottom. It seems to me he's symbolically pointing to the fact that Jesus was entirely "united" as a person. ("Unite my heart to fear your name") Not 50% God, 50% man, but 100% God-Man.
26: Who was Clopas? No idea, but the fact John mentions him most likely means he was someone the typical reader of John would know. "Oh really? Clopas' wife Mary was there at the cross? Wow, I gotta talk to her about how that was..."
27: Joseph had clearly already died and Jesus was making sure his mother would be taken care of.
Oh the wonderful cross! Centerpiece of history, connection between God and man. The climax of our greatest sin (murdering the author of life!) and ironically of our ultimate and total salvation.
And when I think that God His Son not sparing
Sent Him to die, I scarce can take it in.
That on the cross, my burden gladly bearing
He bled and died to take away my sin
Then sings my soul, my Savior, God, to Thee
How great Thou art, how great Thou art