When Chuck and Sarah begin to move in bed, Sarah's pillow seems to reposition itself a number of times directly behind her side of the bed to the middle and back without any indication of it resulting from movement by either Sarah or Chuck.
When Awesome knocks on Casey's front door before opening it, in the upper-right-hand corner a sliver of light from the cheap door moving is visible. Even as Devon fiddles with the lock, the door clearly moves more than it should.
In the very last scene you can see the shadows of two crew members on the truck as it pulls away.
In the scene where Chuck and his father show up at the apartment to surprise Ellie, you can see the reflection of a member of the crew moving behind one of the windows.