The co-stars were spotting filming scenes for the HBO movie on Monday afternoon (July 24) in New York City.
Al is playing the role of disgraced Penn State football coach Joe Paterno in the film, which follows the scandal that erupted surrounding Jerry Sandusky.
Meanwhile, Riley is set to portray Sara Ganim, the journalist who broke the news of the scandal.
Joe died in January 2012, just months after he was fired from his job following the revelation that he covered up Jerry‘s sexual abuse crimes.
Happy Valley is expected to be released in 2018.