1. Marlene King wrote the movie erstwhile she was 10 years aged and said it was astir her radical of friends increasing up. "This truly was my childhood...I had immoderate champion friends, we did séances successful the graveyard, we loved a bully mystery," King said during a Q&A astatine a 20th day screening of the movie successful 2015. "And my parents were besides getting divorced astatine that time. It truly was a true-to-life happening for me."

Samantha was based connected her sister, Sandra, and King joked she herself was "everyone but Chrissy."

2. The 4 younger versions of the girls were formed archetypal and began with Christina Ricci landing the portion of Roberta. For the last week of filming successful Savannah, the big counterparts were brought in. King revealed that Demi Moore (who played Samantha and was a shaper connected the film), Rosie O'Donnell (Roberta), Melanie Griffith (Teeny) and Rita Wilson (Chrissy) watched footage of the girls' performances to pass their ain takes connected the characters. 

3. The 2 incarnations of the quartet were ne'er connected acceptable astatine the aforesaid time. 

4. While she yet agreed to play the older mentation of Roberta, it took a batch of effort from shaper Jennifer Todd and Moore to person O'Donnell to motion on. "We truly wanted Rosie and Rosie truly wasn't convinced she wanted to bash it and we went connected this brainsick adventure," Todd said, explaining she and Moore went to New York to spot O'Donnell successful Grease connected Broadway successful an effort to woo her. "We did that rude, pushy happening were we went backstage afterwards, and were like, 'Hi, tin we instrumentality you to dinner?'"

5. Thora Birch revealed that she and her chap 1970-era starring ladies were arsenic adjacent arsenic sisters, which pb to immoderate arguments connected the set. "That's however we knew we were close," she said, "we were truly bully astatine fighting."

6. All 4 pb girls had a "wild crush" connected Devon Sawa, Birch admitted. But, like, didn't everyone person a happening for the Casper prima successful the '90s? 

"There was immoderate benignant of contest, I retrieve they said, 'Get with Devon,'" Todd revealed. "We were like, 'What does 'get with' mean?!'"

7. While Sawa politely said "no comment," Birch wasn't truthful tight-lipped, revealing his Casper co-star Ricci won the contest. "She got retired beforehand and the different girls weren't blessed astir it," Todd spilled.

Said Sawa, "I was the lone 15-year-old lad with the formed of the hottest young girls successful town, truthful it was a batch of fun."

8. But successful an interrogation with E! News, Sawa credited Ricci with getting him formed arsenic Scott. "We got on rather good successful the tiny magnitude of clip I did enactment connected Casper," helium explained. "She conscionable remembered and recommended maine and I enactment myself connected portion and I got it. We hung retired a batch during the shoot."

9. Leonardo DiCaprio was primitively acceptable to play the relation of the Vietnam War seasoned the girls conscionable connected their motorcycle adventure, but helium dropped retired astatine the past minute. "It was a large woody due to the fact that we had to get idiosyncratic connected a level beauteous rapidly to travel down," Todd said during the 2015 screening Q&A. "And an cause had called and pitched maine and said, 'You should look astatine this caller guy, Matt Damon.'" Alas, Todd said they didn't adjacent extremity up getting to Damon as they saw Brendan Fraser and liked him.

10. Remember the country successful the cemetery wherever a vertebrate scares the girls? "That was scripted to beryllium an owl and the owl died connected set," King revealed. "We utilized a hawk alternatively of an owl."

11. Birch confirmed that determination was really pudding successful the balloons that Teeny utilized to worldly her bra successful the movie. "It's the texture," she joked. 

12. While the 4 girls rode their bikes everywhere, 1 of the stars had ne'er really ridden 1 earlier filming began. "That's truly embarrassing," Birch admitted. "It was horrible. I was the 1 with the skinniest tires connected my motorcycle truthful I was conscionable flopping each over."

13. The celebrated bike-ride sing-a-long acceptable to "Knock Three Times" was primitively scripted to see a Diana Ross song. "No 1 could sing it due to the fact that it was excessively hard," King explained of the change. 

14. The movie was primitively called The Gaslight Addition, the subdivision the characters lived in. 

15. The photograph of Roberta's dormant parent that she carries everywhere? It's shaper Jennifer Todd.

16. That rumor astir pausing the movie astatine a a definite clip truthful you tin spot Sawa's penis is truthful not true, according to the star. "I've ever wanted to code that," helium said. "It's not true, we wore these sock things, which astatine the property of 14 oregon 15, was highly embarrassing!"

17. The young stars bonded implicit a precise circumstantial shared interest. "We each were oddly and creepily obsessed with Pulp Fiction," Birch revealed. "I retrieve we each went and saw it similar 10 times." But the biggest Quentin Tarantino fan? "I cognize Christina was like, the astir obsessed," she added. "She went 14 times and announced it to everyone."

18. Samantha's small sister successful the movie was played by Moore's oldest daughter, Rumer Willis.

19. One large alteration that went down during accumulation wasn't revealed until 20 years later. "The publication was written, and past we changeable [the movie] with the volition of Roberta being gay," King told Entertainment Tonight in 2015. 

But erstwhile the movie was screened for trial audiences, King explained, viewers "freaked out" erstwhile Roberta besides served arsenic Chrissy's gynecologist during the labour scene.  "They were like, 'Ew, she's a lesbian and she's looking astatine her vagina!'" King recalled. "And we were like, 'What? Seriously? Do you truly care?'"

Ultimately, the publication was changed, with King saying, "It wasn't my determination by immoderate way, shape, oregon form. I cognize Rosie was truly upset erstwhile they changed it astatine the past minute, and we each were."