Three years after following Juliet and Chief Vick to San Francisco, Shawn and Gus have settled into their new city, founding Psychphrancisco as their new agency. Shawn and Juliet still haven't married, nor have they gotten the engagement ring back that was stolen mid-proposal. The gang takes on a new case, as a menacing British villain calling himself The Duke is hunting Juliet. What results is a harrowing ordeal that brings together faces old and new.
This film contains examples of:
- Action Prologue: The movie starts with Shawn confronting a fence, stealing a sack filled with stolen jewelry, and leading them on a merry chase.
- Actor Allusion: When they finally start getting the upper hand on her, Woody and Henry start hitting Heather Rockrear (played by Allison Fliehr, AKA WWE's Charlotte Flair) with folding chairs.
- Affably Evil: The Black Gentleman Ninja gives Juliet and Shawn his sincerest congratulations at their impromptu wedding.
- Age Lift: Vick's daughter, born in the first season of the show, is now a teenager. It's not Soap Opera Rapid Aging Syndrome because it actually has been that long. She would've been seven when the series ended.
- Angry Guard Dog: Shawn and Gus run into one in the mental asylum. It's a rescue, and Shawn thinks he can turn it back into a good sweet boy (because he's seen three and a half episodes of The Dog Whisperer). Turns out, he can, with the help of some organic jerky.
- Bad "Bad Acting": Buzz's hammy fake heart attack.Buzz: Let this be a cautionary tale.
- The Bus Came Back:
- Ralph Macchio reprises his role as Nick Conforth.
- Mary, who was killed in the third season finale, returns. In a dream, but still.
- Allison Cowley, last seen "Mr. Ying Presents...," is revealed as the Big Bad.
- Ewan shows up, mysteriously, at the end of the movie to drop off a wedding present and escape pursuers.
- Call-Back: Plenty, naturally.
- Soup Can Sam's half-beard shows up again. Underneath another fake beard.
- The reason Shawn robbed the fence in the open was because he was looking for the ring that got stolen in the series finale.
- The Cuatro Quesos Dos Fritos are back!
- During the girl fight, Juliet's the one who gets thrown through a glass-top table.
- Christmas Episode: It's a Christmastime adventure for Shawn and Gus.
- Crazy-Prepared: Juliet's partner, Sam, is a lot like Lassiter in stashing guns in his apartment. He has one hidden in a gingerbread house.
- Curb-Stomp Battle: Henry and Woody get thoroughly man-handled by Heather Rockrear.
- Designated Girl Fight: Unsurprisingly, Allison wants to get a reprise.
- Epic Fail: Subverted with Shawn shuffling the tarot deck. He flubs it initially, then manipulates them like a professional.
- Found Family: Everyone shows up to help when Billy kidnaps Vick's daughter. Juliet, who Billy wanted, and Shawn, Gus, Henry, and even Woody.
- Friend to All Living Things: Shawn adopts the Angry Guard Dog, naming it Steven Morrissey.
- Hijacked by Ganon: Turns out Billy is being managed by Allison Cowley.
- It's Personal: For both sides. The villain is targeting Juliet because he was her snitch and she sent him to prison anyway.
- Just Toying with Them: Allison's minions have been instructed to toy with their victims, give them a chance to think they can win, then ultimately kill them in whatever order they wish.
- Lampshade Hanging:
- Juliet notes how, in all the time she's worked with Vick, she's never actually seen the Chief's husband.
- Shawn and Gus have a conversation while Allison is monologuing, such that we can't hear what she's saying, in which Gus points out that some painter's cheesecloth has been disturbed, then we cut back to Allison saying, "Zero attention span, am I right?"
- Male Might, Female Finesse: Inverted with Black Gentleman Ninja and Heather Rockrear. Black Gentleman Ninja uses Eastern martial arts and displays incredible speed and agility in a fight. Heather is played by Charlotte Flair and uses wrestling moves.
- Manifesto-Making Malcontent: The Duke has an extensive manifesto about The Crimes of Juliet O'Hara.
- No Name Given: We never hear names for Billy's two minions, just their nicknames: Heather Rockrear and Black Gentleman Ninja.
- No-Sell: Juliet monologues for a bit ("This is the weirdest stalling for time I've ever heard.") before doing a kip-up. She trades a few blows with and knocks Allison to the ground, stealing the shotgun. When Allison tries to do her own kip-up, Juliet just clubs her in the face with the butt of the shotgun on the way up. Down for the count.
- Oh, Crap!: A bunch.
- Juliet stops a would-be thief, and it turns out she knows the girl. It turns out she's Vick's daughter.
- Sam gets one when his conversation with The Duke goes downhill.The Duke: I've also changed. I no longer work alone.
- Juliet visits the hospital to talk to her partner, Sam, and spots a number of people being rushed out, several people lying on the floor, and doctors trying, and failing, to resuscitate Sam.
- Once an Episode: The every-episode pineapple doesn't show up until the very end of the movie.
- Running Gag: The film regularly has people commenting on Juliet not wearing a ring.
- Room Full of Crazy: Shawn and Gus walk into Shawn and Juliet's apartment to see she's created a giant wall of crazy based on all the people mentioned in The Crimes of Juliet O'Hara. They're bad guys she put away, but who she had to bend the rules to do it.
- Serious Business: Gus's love of Pluto returns and starts an argument between him and his new love interest when she points the observatory's telescope at the ninth planet... Eris.
- Shout-Out: The new Psych office is an homage to the mysterious shop in Gremlins.
- Slap-Slap-Kiss: Gus and Selene's argument rapidly escalates to a furious make-out.
- Stalker with a Crush: Selene did serious background research on Gus and tracked him down at the morgue (he posted it on Instagram), declaring that she has chosen him. Then she hands him her resume.
- This Is for Emphasis, Bitch!: "I'm the assistant coroner, bitch!" He then immediately starts apologizing.
- Time Skip: It's been three years since the series finale. Coincidentally, that's also how much time passed between the series finale and the debut of the film.
