Shawn shows Gus the space he rented for their new office in pilot episode. Gus pulls Shawn outside to remind Shawn that he cannot speak with the dead and to argue against taking the case in episode 1x04 "Woman Seeking Dead Husband: Smokers Okay, No Pets". A hooded figure tries to hit Shawn and Gus with a car in episode 1x07 "Who Ya Gonna Call?". Shawn and Gus see their former classmate Trish Connors and her father, Henry's old police captain, talking outside the office in episode 1x09 "Forget Me Not".
Shawn and Gus show up to investigate the disappearance of the McCallum heir in pilot episode.
Gus wakes up after hearing a strange noise in his apartment and finds Shawn making coffee in his kitchen in pilot episode.
Coffee shop where Shawn, Gus, & Lassiter look at the stuff in the back of Henry's truck in episode #113 "Game, Set… Muuurder?". Also where Shawn fake proposes to Juliet in episode #208 "Rob-a-Bye Baby".
Shaw finds Gus at a clinic on his sales route to discuss the case. Only appears in the extended international version of the pilot. in pilot episode.
Gus is talking to one of his clients on the phone when he sees something on the spelling bee broadcast on TV which gives him a clue on the case in episode 1x02 "Spellingg Bee".
Shawn goes to the police station to talk to them about the crime he reported only to find himself under suspicion in pilot episode. Lassiter's car is stolen from in front of the police station in episode 2x04 "Zero to Murder in Sixty Seconds".
Shawn and Gus park the Blueberry and head across the street to deliver information to Lassiter and Detective Barry in pilot episode. Shawn meets Uncle Burton for the first time in episode 2x06 "Meat Is Murder, But Murder Is Also Murder". The destroyed Blueberry is parked in episode 6x02 "Last Night Gus".
Henry lives in the same house he raised Shawn in which is seen in both flashbacks and modern day throughout the series. Shawn asks his father for a favor running a sample through the lab, but Henry makes him jump through a series of hoops to make up for his past irresponsibility before handing over the results in episode 1x02 "Spellingg Bee". In a flashback to 1989, Henry has young Shawn accompany him on a stakeout of their home looking for a newspaper thief in episode 1x04 "Woman Seeking Dead Husband: Smokers Okay, No Pets". Henry uses cereal to teach young Shawn a lesson about turning a problem upside down in episode 1x05 "9 Lives". Henry council's young Shawn to come up with another approach to dealing with his bully in episode 1x07 "Who Ya Gonna Call?". Shawn comes home in his cape to find Henry waiting for him with a lesson on what makes a real hero in episode 1x08 "Shawn vs. the Red Phantom". Shawn talks to his father about Brett Connors's suspicions and the siminlar case from decades ago in episode 1x09 "Forget Me Not". Shawn and Gus head to Henry's house to ask about the plants in Hugo's garden where they discover that he has a woman over in episode 1x10 "From the Earth to Starbucks". Young Shawn tries to sneak back home with a black eye after getting punched by a girl at his school and in the present Gus comes over for his date with Darcy in episode 1x11 "He Loves Me, He Loves Me Not, He Loves Me, Oops He's Dead".
Lassiter is leading the investigation of a stolen ring and Shawn sneaks into the hotel to do some investigating on his own in episode 1x03 "Speak Now or Forever Hold Your Piece".
Juliet and Karen Vick join Marlowe and her friend for her Bachelorette party in episode #707 "Deez Nups".
Juliet brings Lassiter information on the stress line while he is sitting outside eating lunch in episode 1x05 "9 Lives". Young Shawn runs down the beach wearing a cape. Later Shawn goes on a date with the studio executive Talia where he asks her about the bribery and kidnapping in episode 1x08 "Shawn vs. the Red Phantom". A dead surfer is found on the beach in episode 5x02 "Feet Don't Kill Me Now". Juliet and Rachel chat on the beach in episode 7x12 "Dead Air".
Shawn and Gus head to the coffee shop where Brett Connors believes he saw something making him believe a murder had been committed and they run into Brett and Henry in episode 1x09 "Forget Me Not". Shaun and Gus meet up with Brandon for their fake date in episode 1x14 "Poker? I Barely Know Her". From episode 4x13 "Death Is in the Air".
Shawn takes on a job at the space center which Gus frequently visits to see a girl as part of an investigation into a death at the observatory in episode 1x10 "From the Earth to Starbucks".
Grocery store with the secret betting parlor in the back in episode #513 "We'd Like to Thank the Academy".
Shawn and Gus are buying candy with Henry when Shawn ends up winning a contest and getting a bunch of free stuff in episode 1x10 "From the Earth to Starbucks".
Where Juliet talks to Alice Bundy in episode 1x15 "Scary Sherry: Bianca's Toast". Also used as an establishing shot in episode 4x15 "The Head, the Tail, the Whole Damn Episode".
Front entrance to the museum Shawn & Gus visit at the start of episode #610 "Indiana Shawn and the Temple of the Kinda Crappy, Rusty Old Dagger".
Archaeology department where the murder victim worked in episode 2x02 "65 Million Years Off".
Lab where Dr. Richard Colbert is found dead in episode 3x05 "Disco Didn't Die. It Was Murdered!".
Restaurant where Dutch the Clutch jumps off the balcony from in episode #303 "Daredevils!". Also where the Mr. Yang clue is left near the beginning of episode #316 "An Evening with Mr. Yang".
Kenny Loggins is found dead here in episode #311 "Lassie Did a Bad, Bad Thing".
Dock where Henry keeps his boat in episode #310 "Six Feet Under the Sea". Also the dock where Lassiter & Juliet go to try and get a boat to hunt the shark and where Shawn & Gus leave with the fisherman in episode #415 "The Head, the Tail, the Whole Damn Episode".
Camp where the pool scene from episode #315 "Tuesday the 17th" take place. This pool has since been removed.
Street (just outside the entrance to the park) where Juliet and Lassiter pull over the wrong car in episode #513 "We'd Like to Thank the Academy".
Area where Shawn and Gus go through the SBPD obstacle course & shooting gallery in episode #513 "We'd Like to Thank the Academy".
Exterior of For Nicholas Army base in episode #410 "You Can't Handle This Episode".
Shawn and Gus arrive at the prison for Jack Atwater's transfer back to police custody only to see him shot in episode #701 "Santabarbaratown 2".
The Psych team sees one of the actors with the director beneath the theatre in episode #715 "Psych the Musical".
Shawn and Gus are driven into the base by Ewan O'Hara in episode #410 "You Can't Handle This Episode".
The team talk to the head of the mental institution after a patient escapes in episode #715 "Psych the Musical".
Industrial area where Mr. Yin leads the team and captures Juliet in episode #416 "Mr. Yin Presents".
Warehouse where Mr. Yin draws Mary and later the team in episode #416 "Mr. Yin Presents". (I'm fairly certain this is here)
Woody answer's Shawn call in his trailer which is parked in a sketchy industrial area and not the beach in episode #709 "Juliet Wears the Pantsuit".
Movie theater where Shawn pretends to see "The Little Mermaid" in the intro of episode #416 "Mr. Yin Presents".
Juliet goes on a date with Lordan as part of the sting when she is confronted by Gus in episode #702 "Juliet Takes a Luvvah".
Law firm that Shawn and Gus follow Toby Shore from, then chase him while wearing silly costumes in episode #503 "Not Even Close…Encounters".
Shawn stands outside the hospital concerned for father only to encounter Chelsea trolling for elderly hotties in episode #701 "Santabarbaratown 2".
Theatre where the first murder of the episode takes place in episode #504 "Chivalry Is Not Dead…But Someone Is".
Lloyd brings Henry to the airport, where they take off in a small plane while being pursued by gunmen in episode #704 "No Country for Two Old Men".
Shawn and Gus go to pick up Rita Quinn at the airport, and later they stop Leo Quinn from fleeing in episode #714 "No Trout About It".
Henry goes to pick up a package for Juliet's step-father Lloyd and his attacked by some thugs in episode #704 "No Country for Two Old Men".
Henry and Lloyd stop briefly in an alley after escaping some gunmen in episode #704 "No Country for Two Old Men".
Shawn, Gus, and Juliet talk to the Mexican Police about the kidnapping of Henry and Lloyd in episode #704 "No Country for Two Old Men".