Movies
007 - In the remastered version of Infiltrating the Airship during Pure Blooded Thief route, a golden gun can be seen in the vault. This is a reference to the movie The Man with the Golden Gun.
300
A picture of King Leonidas can be seen during Medieval Section QTE in Stealing the Diamond.
A fail message in Completing the Mission (more specifically Finish Him after the Right Hand Man meets his defeat after he spars with Henry in Master Bounty Hunter: "This! Is! Toppats!") references King Leonidas' iconic quote: "This! Is! Sparta!"
Alice in Wonderland - There is an option in Fleeing the Complex called "Cookie", and the icing reads "Eat me". When Henry eats it he grows and cracks the cell, just like how Alice grows. Similarly, the fail message is "How curious." quoting the 1951 movie.
Avengers: Infinity War - A fail message in Completing the Mission references ("Dread it, run from it, the shell arrives all the same!") Thanos' opening speech: "Dread it, run from it, destiny arrives all the same."
Captain America: Civil War - The ending of "Toppat Civil Warfare" in Completing the Mission likely resembles the events from that movie.
The Devil's Advocate - In Escaping the Prison, Henry has Kevin Lomax (the main character from the movie)'s number as a lawyer contact in his cellphone.
Distant Drums - The memetic "Wilhelm Scream" from this film can be heard during the epic ending of Stealing the Diamond (flash version only).
Downfall - Adolf Hitler's portrait from the ranting scene can be found in the WWII section in Stealing the Diamond.
Fast and Furious - The fail message (Henry 7) and the scene during destroyed bridge QTE in "Pardoned Pals/Toppat Recruit" Ending from Completing the Mission is likely referenced from Furious 7 movie.
The fail message is a reference to the blooper reel of Rush Hour 2, where Chris Tucker's character comments on the antagonist falling to his death. ("Dang! He ain't gonna be in Rush Hour 3!")
Harry Potter/Avatar: The Last Airbender/The Lord of the Rings - "You're a bender, Harry -Gandalf" is the metal bend fail screen and it is a parody of the quote "You're a wizard, Harry" said by the character Hagrid. However, Metal Bend's true origin is the Bending Arts from Avatar: The Last Airbender.
The Incredibles - In Infiltrating the Airship, Henry uses Zero-Point Energy in a failed attempt to steal a safe from the Toppat Airship; the Zero-Point Energy is a reference to Syndrome's gadget to immobilize and capture the Incredibles, p