#Fact n'1
Olivia Wilde was almost cast as Marissa Cooper. The role went to Mischa Barton because Wilde was “too strong” for the role. She ended up playing Alex Kelly in Season 2.

#Fact n'2
When Adam Brody auditioned, Josh Schwartz said he hated him and wanted him to get out. Adam had been auditioning for several pilots that day and hadn’t come prepared. After a month with no Seth Cohen, they eventually called Brody back and he got the part.

#Fact n'3
In early drafts of the script, Ryan Atwood was originally going to be Sandy Cohen’s illegitimate child.

#Fact n'4
Chad Michael Murray was reportedly offered a part in The O.C., but turned it down for One Tree Hill.

#Fact n'5
The Cohen’s pool is actually only four feet deep, which means the actors had to film swimming scenes on their knees.

#Fact n'6
Rachel Bilson was originally only a guest star, but the role of Summer Roberts became so important that they made her a main character.

#Fact n'7
The producers almost didn’t use the iconic Phantom Planet song for the intro. They thought it was too mainstream, but they added the song because they needed to show the network something before the pilot premiered. Everyone ended up loving it, so they used “California” for the theme song.

#Fact n'8
Seth was reportedly going to be a part of the popular clique, but the writers decided to make him an outcast.

All of these are very interesting. I didn't know any of these, except fact 6

^Same.

I chose 1 because I'm shocked that they ever considered Olivia to be Marissa....I mean she is so not 'Marissa'!
Like what they concluded, she's too strong and rough looking for Marissa..glad they chose Mischa, who was perfect for Marissa! :)

The only one I didn't originally know !