To me, Ellen Page is the female Sam Worthington. Heck, I just Google Imaged her before I started typing, and already I can’t remember what she looks like. Just a generic dark-haired girl. She was a major character in Inception, but I can’t remember how she was relevant to the plot. In Juno, she was just a generic girl with a few “wacky” items stapled onto her.
Chris Evans, aka Captain America / the Human Torch is also incredibly generic.
One of a thousand interchangeable handsome-ish stubble-faced men in Hollywood. I just found out from his Wiki page that he played a fairly large role in Scott Pilgrim. I’ve seen that movie a few times, and had no idea it was him.
Most unmemorable actress of that era…Vera Miles. Janet Leigh gets killed in the first 5 minutes of Psycho after committing embezzlement, is the entire raison d’être for the movie, and no one remembers that Vera Miles plays her sister that comes to track her down. Tony Perkins they remember. Even Martin Balsam and John Gavin. Vera Miles fades into the woodwork.