Did Atticus have any flaws?

He's only human. Towards the end of the film I feel like he's exhausted, making poor judgement on the circumstances of Tom Robinson's death and outright giving up when the sheriff expresses disinterest in arresting Boo.

I agree that Atticus borders on being perfect. But he's so convincingly written that I like to believe that men like him can really exist. That said, I noticed a couple of flaws:

1. He's too much of an idealist when it comes to believing in the inherent goodness of other people. Granted, the underlying message of TKAM is that no one is inherently bad and you can understand them better if you only see things from their perspective (case in point: black people in Maycomb - especially Tom Robinson - and Boo Radley). However, Atticus really did believe that Bob Ewell wouldn't stoop to trying to kill his children, and that the rednecks wouldn't be prepared to hurt Atticus in trying to lynch Tom Robinson. By acting on these beliefs, he put himself and his children in deep danger. In both cases, someone else had to rescue them.

2. In the book, it's implied that Atticus tends to freeze when he is actually frightened. That's mostly all right, since Atticus isn't easily frightened. But it shows through in a couple of scenes. The first is when his children and Dill are exposed to the lynch mob. Atticus is described as moving slowly like an old man and reaching a sort of meltdown when he can't persuade Jem to leave with the children. He is in tears by the time that the lynch mob leaves. But it's clear that he couldn't have saved the children by himself. The second occasion is when Sheriff Tate is trying to reveal to him that Bob Ewell's manner of death should be hushed up because it's Boo Radley who is responsible. Atticus is so shaken by all the events that for a long while he can't even see what the Sheriff is getting at. When he does, he is still in a daze (again described as moving like an old man) until Scout alleviates his moral dilemma by commenting that revealing the truth about Ewell's death would be like shooting a mockingbird.

So yes, Atticus does have shortcomings. It's just that I don't think they are serious enough to detract ever so slightly from his character. The characterisation of Atticus in "Go Set A Watchman" as a racist doesn't count, because "Go Set A Watchman" was a first draft of TKAM. It is therefore the TKAM Atticus who is the final form of the character as envisaged by Harper Lee.