Every diehard Friends fan know the basic behind-the-scenes information. Those things you call trivia about the show? That's just regular stuff, no big deal. Yes, Phoebe's terrified of the duck, Joey's agent Estelle once played the role of the nurse in the one with the birth, Courteney Cox was supposed to read for Rachel, but chose Monica instead. Yeah, we already know that.

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What you're about to read are five observations only a hardcore Friends fan would've observed from watching all the seasons over and over again.

1.The Elle Macpherson premonition

In the One with the Princess Leia Fantasy, Ross was telling Chandler that girls share everything with their girlfriends, and perhaps they should do the same. Ross then told Chandler about his Princess Leia in the gold bikini fantasy, which Chandler also has. When it was Chandler's turn, he told Ross that sometimes, while he's being intimate with a woman, an image of his mom pops in his mind, making the situation uncomfortable.

Chandler: You know, you're fooling around with her, and you get all these like, mental images in your brain, like Elle Macpherson, or that girl at the Xerox place. Then all of a sudden, your mom pops into your head.

Three seasons later, Elle Macpherson would appear as Janine Lecroix, Joey's Australian roommate who moved in shortly after Chandler moved out. She also had a brief relationship with Joey, until she moved out in The One with the Apothecary Table because she can't stand Monica and Chandler.

2. Space Oddity

In the One Where Ross Can't Flirt, Joey's grandmother visited him to watch his appearance in Law & Order as a dying man. Unfortunately, Joey's scene was cut out of the show because he can't act accordingly. Not wanting to disappoint his grandmother, he taped himself in a sort of hostage situation and made his grandmother watch it. After his "big scene," Chandler singing Space Oddity by David Bowie appeared, which they quickly turned off.

In the first episode of the next season, The One After Vegas, Joey sang the same song to make Phoebe forgive him for picking up a hitchhiker.

3. Extras

Jasmine (Cynthia Mann) appeared as a waitress in The Pilot,but went on to play Phoebe's coworker as a masseuse.

Kim Harris portrayed the store owner of the overpriced gown boutique in The One With the Cheap Wedding Dress. In the One With the Donor, she also played the spritzer in the mall where Rachel, Phoebe, and Charlie were shopping.

4. From Friends to Now You See Me

Okay, this isn't really a trivia about Friends per se. Cailin, Ross' date in Joey's play from The One With the Screamer, was played by Laura Cayouette. She's also the woman in the 2013 film Now You See Me who was hypnotized by Woody Harrelson (Merritt McKinney) in the opening credits.   

TagsFriends, Friends trivia