By Behind Celeb Staff | Published on June 8, 2025
From mysterious messages to shocking betrayals, *Pretty Little Liars* captivated millions. But what happened off-screen was just as dramatic. Here are 22 jaw-dropping secrets you didn’t know about the hit series.
1. Sasha Pieterse Was Only 12 When She Was Cast
Sasha Pieterse, who played Alison, was just 12 years old when filming began—making her scenes with older co-stars quite a feat.
2. Lucy Hale Auditioned for Spencer
Lucy originally tried out for Spencer Hastings but was later cast as Aria Montgomery—a perfect switch in hindsight.
3. The "A" Reveal Kept Changing
Even the cast didn’t know who “A” was for most of the show. The identity changed multiple times due to fan theories and rewrites.
4. Shay Mitchell Lied to Get the Role
Shay Mitchell originally claimed she could speak Spanish fluently to get the audition. Spoiler: she couldn’t.
5. Troian Bellisario Struggled With Mental Health
Troian opened up post-show about her battles with an eating disorder and anxiety during filming.
6. On-Set Romance Rumors Were Real
Several co-stars, including Ashley Benson and Tyler Blackburn, were rumored to have dated off-camera.
7. Sasha Almost Didn’t Return After Season 4
Her character was meant to stay “dead,” but fan interest brought Alison back to life (and Rosewood).
8. Ian Harding Hated Ezra’s Secret
Ian was uncomfortable with Ezra dating his student and the eventual reveal that he was spying on the girls.
9. The Fake Texts Were Actually Sent
During some scenes, producers actually sent the “A” texts to the actors’ real phones for authenticity.
10. Rosewood Is Just Stars Hollow Reused
The show used the same backlot as *Gilmore Girls*. Look closely—you’ll recognize Luke’s Diner in some scenes!
11. Spencer Had to Use a Wig
Troian once had to wear a wig after cutting her hair shorter for a movie role between seasons.
12. The Halloween Episodes Were Filmed in July
Filming fall-themed episodes in the heat of summer was a major challenge—fake pumpkins and sweat included.
13. Some Fans Guessed the Ending
Writers had to change “A’s” identity at least once because Reddit and Tumblr users figured it out early.
14. Lucy Hale Wasn’t a Fan of Aria’s Wardrobe
Lucy admitted she felt uncomfortable with some of Aria’s over-the-top looks in the early seasons.
15. Shay Mitchell Did Her Own Stunts
From underwater scenes to dramatic falls, Shay insisted on doing many of Emily’s action moments herself.
16. The Theme Song Wasn’t Written for the Show
“Secret” by The Pierces was chosen after producers heard it randomly—it wasn’t custom made for PLL.
17. Alison’s Funeral Took Two Days to Shoot
The famous funeral scene in Episode 1 took two full days and was shot entirely out of order.
18. The Series Had Over 30 Costume Changes Per Episode
Between flashbacks and plot twists, the show’s wardrobe department was constantly reinventing looks.
19. There Were Tensions on Set
Reports suggest some cast members had off-screen disagreements, especially toward the later seasons.
20. Caleb’s Spin-Off Was Canceled Quickly
Tyler Blackburn’s spin-off *Ravenswood* was short-lived, canceled after just one season.
21. A Crew Member Accidentally Leaked a Spoiler
During a behind-the-scenes promo shoot, a crew member mentioned a major plot twist that hadn’t aired yet—forcing a rewrite.
22. There’s Still Hope for a Reboot
In 2023, showrunner I. Marlene King hinted at a possible limited-series revival featuring the original cast.
Whether you loved the plot twists or loathed the endless messages from “A,” one thing’s clear: *Pretty Little Liars* is still full of secrets.
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