10+ 'Happy Days' Behind-The-Scenes Secrets Fans Didn't Know

The hit show ran for 10 years from 1974 to 1984.

It even spawned five spinoffs, including Laverne & Shirley and Mork & Mindy. While these two were successful, these three other spin-offs weren't: Joanie Loves Chachi, Blansky's Beauties, and_ Out of the Blue_.

The late Garry Marshall was a legend in the entertainment world.

In addition to Pretty Woman and Happy Days, he directed Beaches, The Princess Diaries, Never Been Kissed, as well as adapting a play into The Odd Couple for television.

When Marshall was having a lot of trouble casting the role of Mork from Ork, he turned to his sister.

She ended up recommending a comedian she had seen on the street: Mr. Robin Williams.

Robin was such a hit from the start.

Winkler even once said on Home & Family that he was unable to stop himself from laughing while they were filming the “My Favorite Orkan” episode.

The late singer visited the set with his dad since he was such a huge fan of the show.

While he was there, he signed autographs and even drew doodles for the cast and crew.

The actor had just enrolled in USC’s School of Cinematic Arts to fulfill his dream of being a director.

But since going to college was no longer considered a deferment for the war, he chose employment deferment.

While the pilot never sold in the end, it did buy him enough time for President Nixon to end the draft shortly after filming had wrapped.

That's because the Monkees drummer Micky Dolenz was the Marshall's first choice.

But since he was so tall and towered over Ron Howard, Winkler was a better fit (literally).

The cast that acts together, plays together! At least that was Marshalls thought process when he formed the Happy Days All-Star Softball Team.

The team would promote the show and raise money for charity.

For instance, he originally named Arthur "Arthur Masciarelli" after his original surname. In the end, he changed it to create the Fonz.

Plus, the first home the Marshalls purchased was on Arcola Street.

After “Rock Around the Clock” by Bill Haley & His Comets worked so well on the first episode of the show, he recorded a new version of his single.

This went on to be the theme song for two seasons.

The actor even made up his lines for his audition since he couldn't read them

“That’s not in the script,” the producers would point out. To this, Winkler replied: “I know but I’m giving you the essence of the character and if I get the part I’ll do it verbatim."

The daredevil cyclist played Fonzie's love interest in Season Four.

Due to their similarities, their on-screen romance got a lot of attention off-screen.

“I grew up on welfare, so I don’t relate to rich kids,” she told People magazine in 1976 about how she struggled to connect with Winkler.

She was soon removed from the show.

If you rewatch Season One, you'll notice that he was only wearing the leather jacket when he was standing next to a motorcycle.

This was because the network was worried the jacket would make him look too rough.

Yes, this is why he rode through the front door of Arnold’s in each episode!

This eventually became a long-running gag.

Before George Lucas made Star Wars, he created the box office hit, American Graffiti.

It's even responsible for Happy Days since ABC picked up the series due to the film.

After Marshall's son saw the movie, he asked his dad one simple request: create a martian episode.

While the sentiment was sweet, the cast did not like the script to "My Favorite Orkan."

"[It] was like the worst script in the history of Happy Days," Anson Williams, who played Potsie Weber, told Hallmark's Home & Family.

Yikes!