I could list a great many possible contradictions, and to every one no doubt some apologist somewhere has valiantly tried to explain it all away.
My pet one however is this:
From a simple reading of the four Gospels is it possible to conclude if:
a) Jesus remained totally silent before Pilate?
or
b) Jesus spoke many words on his own behalf?
I don't understand why you ask this in the first place?
Christ appeared before the High Priest and said a few words, admitting He was the Son of God.
Then He appeared before Pilate.
Mark 15
15 And straightway in the morning the chief priests held a consultation with the elders and scribes and the whole council, and bound Jesus, and carried him away, and delivered him to Pilate.
2 And Pilate asked him, Art thou the King of the Jews?
And he answering said unto them, Thou sayest it.
3 And the chief priests accused him of many things:
but he answered nothing.
4 And Pilate asked him again, saying, Answerest thou nothing? behold how many things they witness against thee.
5
But Jesus yet answered nothing; so that Pilate marvelled.
So mostly, Christ said nothing, IN FRONT OF HIS ACCUSERS which was so unusual, Pilate marvelled.
John, who gives the most detailed crucifixion account tells us that Christ had a private conversation with Pilate, not in front of His Jewish accusers, which went as follows...
John 18
33 Then Pilate entered into the judgment hall again, and called Jesus, and said unto him, Art thou the King of the Jews?
34 Jesus answered him, Sayest thou this thing of thyself, or did others tell it thee of me?
35 Pilate answered, Am I a Jew? Thine own nation and the chief priests have delivered thee unto me: what hast thou done?
36 Jesus answered, My kingdom is not of this world: if my kingdom were of this world, then would my servants fight, that I should not be delivered to the Jews: but now is my kingdom not from hence.
37 Pilate therefore said unto him, Art thou a king then? Jesus answered, Thou sayest that I am a king. To this end was I born, and for this cause came I into the world, that I should bear witness unto the truth. Every one that is of the truth heareth my voice.
38 Pilate saith unto him, What is truth? And when he had said this, he went out again unto the Jews, and saith unto them, I find in him no fault at all.
Then Pilate had Christ scourged, and sent him to Herod.
In front of Herod, Christ said not one word.
Herod sent Jesus back to Pilate after saying he (Herod) found no fault with Christ.
Pilate had one last PRIVATE conversation with Christ, which went as follows. This was after Pilate heard that Christ was called the "Son of God". This phrase frightened Pilate. So Pilate called Christ aside privately to ask Him about this.
John 19
7 The Jews answered him, We have a law, and by our law he ought to die, because he made himself the Son of God.
8 When Pilate therefore heard that saying, he was the more afraid;
9 And went again into the judgment hall, and saith unto Jesus, Whence art thou?
But Jesus gave him no answer.
10 Then saith Pilate unto him,
Speakest thou not unto me? knowest thou not that I have power to crucify thee, and have power to release thee?
11
Jesus answered, Thou couldest have no power at all against me, except it were given thee from above: therefore he that delivered me unto thee hath the greater sin.
Thus, sometimes Christ chose to speak (mostly to Pilate privately) and sometimes Christ chose not to speak (to His Jewish accusers).