- Two unrelated pieces of information at the start both reference an event over 4000 pages away, despite that being impossible because of temporal mechanics.

- One character is canonically in his favourite movie.

- There is a clown religion based around two gods, and the clown pope is both of them.

- One character (Kankri) canonically has his pants pulled all the way up to his neck at all times.

- Someone is so mad that airplanes exist that you automatically get the bad ending if you bring them up, despite his entire personality being airplanes.

- The only character with a nose has it awkwardly brought up for a random flashback

- The character whose entire personality is the cancer constellation, crabs, carcinogens, and actual cancer is a gemini

- A character contemplates using 12 fridge magnet Ws as Ms

- A character throws a soda can at black-and-yellow stormtrooper holding a bazooka

- The main villain puts candycorn into a game cartridge and it appears in the game

- Toby Fox, creator of undertale, lived in the author of homestuck's basement.