Matt Damon and Mark Wahlberg. I couldn't tell them apart in The Departed.
Don't see this one at all...these guys don't look anything alike to me. I'm pretty sure this is not the first thread on this subject, because I know I've posted a couple before but I'll go ahead and post them again:
I often confused:
Liev Schrieber with
Balthazar Getty
I also noticed an unsettling resemblance between:
Charlie Martin Smith and
Barry Livingston