At the end of the movie, when Frances is filling out her name for her mailbox, it's briefly revealed that the "Ha" that makes up the second half of the title stands for "Halladay."
The bathroom scene with Frances and Sophie last 28-seconds, yet it required 42 takes to get it right. Greta Gerwig detailed the experience in a NY Times Magazine article in May 2013 titled 'I Know I'm Doing the Scene Badly, But I Can't Figure Out How to Do It Well'.