Here is a 3-word summary of the end clip of each episode.
Tourist Trapped: Gnome Barfing Rainbows
The Legend of the Gobblewonker: Mabel's Pelican Joke
Headhunters: Mabel Chooses Sweaters
The Hand That Rocks the Mabel: Disco Ball Soos
The Inconveniencing: Stan Finishes Movie
Dipper vs Manliness: Susan Calls Stan
Double Dipper: Soos Pressing Buttons
Irrational Treasure: Court Replaces Trembley
The Time Traveler's Pig: Blendin Gets Busted
Fight Fighters: Gravity Falls Videogame
Little Dipper: Stan Wins Contest
Summerween: LOL Pig Pictures
Boss Mabel: Stan Wrong Song
Bottomless Pit: Stan Falls Again
The Deep End: Kid in Solitary
Carpet Diem: Lost Woman Returns
Boyz Crazy: Sev'ral Timez Concert
Land Before Swine: Arm Pants, Poker
Dreamscaperers: To Be Continued
Gideon Rises: Closeup of Journals
Scaryoke: Agents' Zombie Recovery
Into the Bunker: Bargain Movie Showcase
The Golf War: Controlling the Balls
Sock Opera: Live Action Puppetry
Soos and the Real Girl: Stan, Goldie, Vegas
Little Gift Shop of Horrors: Tic Tac Toe
Society of the Blind Eye: Stan Refuels Portal
Blendin's Game: Soos Gets Hired
The Love God: Goat and Pig
Northwest Mansion Mystery: Agents Discuss Portal