The ticket stubs.
The priest presents 3 ticket stubs for the alibi event that got tommy and John acquitted. The thing is nobody looked at the stubs and they were never entered as evidence by the defense. Wouldn't that be the give away that something was not right?
They could have been for some other date who would know? Brad Pitt was not going to say anything.
What if the judge insisted on seeing them or having them entered as evidence?