Continuity mistake: Michael Keaton is giving the retiring colleague Stewart a bit of a friendly roast. When he says "The corner office is empty", the glasses in his pocket are pointing to the opposite direction than in the rest of the scene. (00:03:30)
Continuity mistake: Mark Ruffalo just hung up the phone and the others are asking him about Cahill's story. The Marshall McLuhan book by him sticks a bit out from the stack at the beginning, but when Michael Keaton arrives, it is within bounds. (00:04:30)
Continuity mistake: At the lunch meeting with Baron reading the Red Sox book, the fork above it is tilted in a different way on the tablecloth. (00:05:45)
Continuity mistake: During their business meeting at the restaurant, Robby says that he's more like a "player-coach" to his team. From that point on you can notice (Keaton's hands were in the way before) that his glass is on the towel in one camera angle and in between his towel and Baron's in the other, switching each time the angles alternate. (00:06:30)
Continuity mistake: Hearing from Walter 'Robby' Robinson at the restaurant that they can take a couple months to come up with a story, Marty Baron stops writing and puts his hand down on the pad. Except, when it switches back to the previous angle, he's still writing. (00:06:45)
Continuity mistake: At the 10:30 meeting, Baron makes his awkward introduction; he says "Hello", and the woman next to him has her hands flat on the desk, he goes on and her palms are raised. (00:08:55)
Continuity mistake: Commenting the lucky putt, Michael Keaton says "I actually had my eyes closed." Rachel McAdams has her hands joined, which become a rather unnatural crossed wrists pose in the next shot. Similar mistake a moment later; cut and her hand from her lap is in writing position on the desk. (00:17:15)
Continuity mistake: In the first interview with Eric Macleish, Rachel McAdams is writing at the top of the notepad ("Why is that?"), the middle, the top again, hand on the pad, hand off the pad, on the pad again. (00:17:45)
Continuity mistake: Saviano says that those priests used the collar to "rape kids." He says it and stretches his fingers, which are clutching the box in the next shot. (00:31:50)
Continuity mistake: When Rachel McAdams is interviewing Joe in the coffee shop, she starts off with a couple of lines written on her notepad, then half a page, then back to a few lines, then a full page, etc. It changes in almost every shot. (00:38:40)
Answer: Cardinal Law may have disinvited him out of suspicion. Or maybe just a clerical error.