The Good Shepherd (2006)
Matt Damon appears uncredited as an undercover CIA agent. Damon played a very similar character in De Niro's film which was set in a similar time period. The characters even look similar in both films.
Wendy and Lacey talking about Matt Damon.
Included in a $2,000 question
Achievement called "The Good Sheppard".
Referenced in dialogue
Alec mentions the movie by name.
onscreen graphic says Robert De Niro directed this ;movie
Robert De Niro talks about the movie he directed
movie discussed and clips shown