Here's a few, Sorry if they've been mentioned before.
Goldfinger: James Bond says ' My dear girl, there are some things that just aren't done, such as drinking Dom Perignon '53 above the temperature of 38 degrees Fahrenheit. That's just as bad as listening to the Beatles without earmuffs!'
The Blues Brothers: 'Who do you think we are the fu**ing Beatles or something?'.
Poltergeist: When the father is trying to make the mother feel better, he sings 'If I fell' to her.
In Apollo 13, when we see the daughter of one of the astronauts she's carrying 'Let It Be'.
Rain man: Raymond and Charlie sing 'I saw her standing there' while in the bathroom.
'Because' is playing at the end of American Beauty.
And my favourite Beatles quote from 'Sliding Doors:
The character of James says this, 'Everyone is born knowing every single Beatles lyric. It's ingested into the fetus along with all that amniotic stuff. In fact, they should be called "the Fetals'.