1. Pretty Little Liars' January 2014 season debut was the most tweeted season premiere in history; more than 30,000 tweets per minute were tweeted during the show.

2. Ashley Tisdale was originally slated to star in the series, but she turned it down to star in Hellcats, a short-lived Kevin Murphy show about competitive cheerleading. Whoops.

3. Pretty Little Liars uses some parts of the same set that the Gilmore Girls used. So basically Stars Hollow = Rosewood.

4. Troian Bellisario, who plays uptight, high-achieving Spencer, was actually valedictorian of her high school class.

5. Chad Lowe, who plays Aria's dad, Byron Montgomery, was once married to Hilary Swank. She famously forgot to thank him when she was accepting her Best Actress Academy Award for Million Dollar Baby. They divorced in 2007.

6. Chad Lowe got his start in TV on the ground-breaking show Life Goes On, which chronicled a family with a kid with Down Syndrome.

7. Ashley Benson (Hanna) was the one who suggested the show's theme song "Secret" by The Pierces. "It's just so spooky and eerie, and it's perfect for the show," she said.