In the scene where Ellen is working at midnight and Harold calls, the scene is shown in reverse. The titles on the book spines and the notes on the board are backwards.
In some birthday-party scenes, daylight is visible through some windows, and lighting on the staircase suggests daylight, although the action is supposed to be at night, and other windows show darkness outdoors.
Kate Gulden: It's so much easier to be happy, my love. It's so much easier to choose to love the things that you have, and you have so much, instead of always yearning for what you're missing, or what it is you're imagining you're missing. It's so much more peaceful.