Keaton said he did not worry the film might be confused with his own story, reported the New York Post.
"There was that moment where you go, 'Is this going to be an issue in terms of having played Batman?'," Keaton said at Le Cirque after the movie closed the New York Film Festival.
"There was almost really no time to discuss this because there was so much work to do," he added.
The movie, which opens this Friday. Is set in Broadway's St James Theatre and shot to look like one continuous take.
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