'Pretty Little Liars' trivia and fun facts

The person who originally played Alison's brother Jason DiLaurentis was Parker Bagley, after season one Drew van Acker took over the part.

The doors you see in Aria's bedroom leads to Spencer's bedroom on set.

In the first episode Toby Cavanaugh is played by James Neate, but was replaced by Keegan Allen in the rest of the series.

In the pilot the role of Mrs DiLaurentis is played by Anne Marie DeLuise, however she was recast and now the role is played by Andrea Parker.

The theme song for the show, 'Secret' by The Pierces, was suggested by Ashley Benson.

Brant Daugherty, who plays Noel Khan, originally auditioned for the role of Ezra Fitz.

Spencer, Emily, Hanna, and Aria are the only people who appear in every single episode.

Marlene King would like to make a 'Pretty Little Liars' movie that is based on the show

Tammin Sursok originally auditioned for the role of Spencer Hastings, but got casted as Jenna Marshall instead

Almost every cast member knew who A was except Lucy Hale. They were afraid she would tell someone else because she's not so good in keeping secrets. She stated that herself in an interview.