Burn After Reading
Pokemon? ?
It was too easy … pillbox knew.
My partner says Dark Angel is very good. But it’s Burn After Reading. i am a Malkovich fan.
In the end, the gophers win
Groundhog day 
Caddyshack
Correct!
(10 characters)
She’s not singing
The milli vanilli story?
not quite
Singing in the rain?
Thought that would be harder. Nice one
Ok. Here’s a proper one.
Man gives advice, repeats advice, ignores advice. (1989)
Gremlins???
Nope. Not gremlins.
Indiana Jones and the Last Crusade?
Karate Kid
Indeed!
Walter Donovan, a character who tells people not to trust anyone in every scene he is in, ends the movie thusly.
He didn’t have better luck as General Veers.
Oddly enough, that was not the character I was thinking of when I guessed that. I thought the clue referred to Indy Sr.'s long-time obsession with the grail. 