Continuity mistake: When Joe realises that Jimmy isn't turning up at the park he goes to a pay phone, puts the red notebook down with the spine faceing to the right and starting phoning the FBI. In the next shot the the notebook has rotated 90 degrees with the spine now facing the wall. (01:06:45)
Continuity mistake: In George's apartment, Joe takes a cigarette out of his mouth and sets it down, then places both empty hands on George's chest, then takes off his glasses, still with no cigarette in his mouth or hand. An instant later, the cigarette is back in his mouth and he again takes it out and sets it down. (01:16:15)