David Cassidy in Popular Culture

The Simpsons

When Marge was young she had a poster of him in her room in the episode called There’s Something About Marrying", S16 E10.

Arrested Development

Arrested Development is an American television sitcom. In "Not Without My Daughter" an episode of Arrested Development Oscar Bluth wears a jacket that reads David Cassidy Live! presumably from a concert.
In the previous episode "Whistler's Mother" Oscar told Michael that David Cassidy was supposed to sing his song "All You Need Is Smiles" on The Mike Douglas Show but he was too embarrassed to do it in front of John and Yoko.

Family Guy

Season 7, episode 15 titled "3 Kings".

iSlinky Squashin’ Martians app

On January 9, 2012 the iSlinky Squashin’ Martians app was released and David sing UFO (U Fine One).

Life on Mars (British TV series)

David's "How Can I Be Sure" was played during the TV series.

Must Love Dogs Movie

During this film, the cast sing "C'mon Get Happy".

Four Weddings and a Funeral

Hugh Grant in Four Weddings and a Funeral says "I just wondered, I really feel, in short, to recap in a slightly clearer version, in the words of David Cassidy, in fact, while he was still with The Partridge Family, I think I love you"

The Lovely Bones Movie

David and The Partridge family are mentioned in the movie The Lovely Bones. The main character in the movie has posters of David Cassidy in her room and in her locker at school. At the house her older sister is watching the TV and a Partridge Family episode is on the TV.

The West Wing

There was a mention of David in an episode of The West Wing where the character "Bruno" who was the campaign manager for the "Vinnick" presidential campaign referred to him as a "rock star just like David Cassidy"

Music - "Sex Like David Cassidy"

In 2012 UK Legend released a CD of a mashup of David's 'I Think I Love You'. The three tracks are electronic, synth-pop dance tracks.

Scream 2

Scream 2 has a scene in the college cafeteria including Jerry O'Connell serenading Neve Campbell with I Think I Love You

The X-Files

In Season 4, episode 13 when Ed Jerse bangs on the floor in his apartment, the girl downstairs cranks up the stereo, playing the Partridge Family song "Doesn't Somebody Want to be Wanted."

Firefly Lane

Firefly Lane tells the story of the nearly three-decades-long friendship between Kate Mularkey and Tully Hart. Though their paths eventually diverge over the years, with Tully focusing on her career and Kate getting married and becoming a stay-at-home mom, the two remain close. In season 2 part 2, Kate has succumbed to her battle with cancer, and the final episode concludes with a funeral for the Firefly Lane character. Kate leaves Tully a final gift. The box from Kate contains important artifacts from her and Tully’s friendship, including a joint, an autographed photo of David Cassidy, an iPod, and most vitally, Kate’s novel about Firefly Lane.