I think storytelling perfection is easier than just "perfect". After all, you are creating the story, if every scene is perfect for the story you are telling...it's "perfect".
A Night at the Opera:
Gone With the Wind:
Casablanca:
Doubel Indemntiy:
Sunset Blvd.
Singing in the Rain
Psycho:
Shadow of a Doubt
Rear Window
It's A Wonderful Life
Jaws
Inglourious Basterds
A Christmas Story
Holy smokes! We have very similar taste in movies! Separated at birth?
I was actually dying to put a Marx Brothers movie on...but there is always one song or some dated joke I would replace. But none better than them.
Ditto with
Gone with the Wind...probably the greatest movie ever made...but I would reshoot the scene where Scarlett says "No I'm not!" at the beginning. It's acted really weird for some reason. It's perfect otherwise.
Casablanca would make it if not for the slightly odd acting when Bogie is at the table drinking and slams his fist on the table. Also the Paris flashback stuff could have been better to me. But it's still one of my very favorite movies.
Shuffling through my favorite comic book movies trying to find any that don't have at least one scene that could be better or some other flaw.
Spider-Man 1 had a bad costume design for the Goblin and Dafoe isn't at his best.
Spider-Man 2 almost makes it...but that doctor scene is off.
Superman 2 has some dicey dialog.
X-Men 2 has the one scene where Magneto acts in a petty and spiteful manner toward Rogue's hair. So close...
I adore
Watchmen but the sex scene isn't perfect.
Iron Man is incredible but the ending could be better.
Batman Begins was poorly cast in a couple of places.
The Dark Knight could use some serious editing and also has casting problems. I've never really liked Batman's costume in any of his movies either.
Iron Man 2 should lose the "drunk Tony" scene.
Maybe
Blade 2? Nothing springs to mind there....nah...nevermind...
Definitely
Kick Ass. I wouldn't change a thing about it.
And...
Mystery Men. I love every second of it.
Pixar makes "perfect" look easy. I wouldn't change a frame or the actors in any of their movies other than
Cars, Ratatouille, and Wall-E. Wall-E is pretty close...but a couple of things in the second half could have been better.
Finding Nemo in particular is picture perfect.
I'll put in
Raising Arizona, Arthur, A Fish Called Wanda, and
Trading Places as comedies that could not be done better. Wish I could put in some Monty Python, but even the Holy Grail has a flaw.
Back to the Future 1 is perfect. No doubt in my mind. (the sequels aren't perfect)
Fellowship of the Ring could not possibly be done any better.
Let Me In. A contender for my favorite movie this year. Chloe Moretz is having a great year.
To Be or Not to Be (Jack Benny, Carol Lombard)
Memento. That's Nolan's perfect movie.