- Accidentally Correct Writing: In the concept art book, Dan Salvato noted that "'Sayori' was some kind of unholy fusion between 'Sayuri' and 'Saori', and to this day Im not even sure if it could pass off as a real Japanese name." However, "Sayori" (さより) is an actual Japanese girls' name (as well as the name of the Japanese halfbeak fish), albeit an uncommon one, as seen with voice actress Sayori Ishizuka.
- Actor Allusion: Dan Salvato, the director behind the game's team, was once known for his modding work in the Super Smash Bros. community, and contributed to the Project M mod before work on it had to be pulled. One of the messages the game can tell you is "PM died for this."
- Creator's Favorite: Game artist Satchely's favourite girl is Natsuki. Writer Dan Salvato, on the other hand, stated in his Reddit AMA thread that to him all the girls are precious and deserve to be loved.
- Cowboy BeBop at His Computer: Following an event where a 15-year-old male committed suicide shortly after playing DDLC, British news outlet BBC listed the game as an online psychological horror game aimed at kids due to the anime graphics and that it promotes suicide. Despite the fact that both the Steam page and the actual game itself upon initial boot up/after Act 1 warns that the game was clearly not made for children or the easily disturbed in mind (it even has you confirmed if you were above the age of 13 to play). The game isn't even online either (It's perfectly functional offline). The only thing BBC got right was that it's free-to-play, and that the game takes a drastic shift in tone towards the end of Act 1.
- Doing It for the Art: The game is free because Dan Salvato feared people might feel being ripped off for paying for a game whose plot swerves completely in content and tone after the end of Act 1. Fortunately, the merchandise sales have more than made up for it.
- Fan Nickname: The girls and MC are often collectively referred to as "Dokis".
- Individually, "Knife Wife" has caught on for Yuri, Sayori is known as "Cinnamon Roll", Natsuki is sometimes referred to as "Cupcake", and MC is referred to as "dense boi".
- In Lattice's Japanese Let's Play, "Pro-chan" is used for Natsuki who describe herself as one. Also, watchers will ask where BGM-san is gone whenever the background music suddenly stops.
- Thanks to It Was His Sled, Sayori has been referred to in Ben "Yahtzee" Croshaw's animation on Zero Punctuation as "Saddo McKillmyself".
- Follow the Leader: Defied. When Undertale was brand-new and the buzz of the Internet, one of Dan Salvato's friends noted that the game had a few coincidental similarities with the project that would eventually become DDLC. Salvato then resolved to not take in any Undertale-related media throughout DDLC's development, lest he become subconsciously influenced by it and thus actually fall into this trope.
- Lost in Translation: Parodied - even though the game was made in English, Natsuki makes a pun about Monika's name that only works in Japanese ("Ika" being the Japanese word for squid). Monika herself notes that the joke doesn't work in English.
- Older Than They Think: The game has been Dan's rather secretive project for over two years, with the single concrete idea of the game being (vaguely) teased only in February 2017, with the actual concept of the game being revealed when it was released in September of that year. This also veers into Crazy-Prepared territory since Monika's Twitter account was created at the same time, periodically tweeting to keep up the masquerade before the game was released, where players would learn about it from Monika herself in Act 3. One of his 20XX update trailers back in 2016 uses Dreams of Love and Literature as its background music, which shows just how long the seeds of the game have been growing.
- The awesome thing is that Dreams of Love and Literature sounds like random music that Dan Salvato just happened to have to hand, and, when he released the first teaser, the only reply didn't even think the reference to a literature club was his next project!
- Reclusive Artist: According to Dan Salvato, Jillian Ashcraft, Monika's voice actress and the singer of "Your Reality", "prefers staying private" for now. There are a few videos online of her singing (she also plays guitar), but not much else.
- Referenced by...: When Tyalie joins the team in BoxxyQuest: The Gathering Storm, a short, remixed snippet of Your Reality plays instead of the normal new party member theme, serving as an early hint to the characters self-awareness.
- Retroactive Recognition: Dan Salvato also made a legendarily difficult Super Mario Maker level that drove Egoraptor to near-insanity in an episode of Game Grumps. The Grumps would later go on to play DDLC and in the final episode included a little Continuity Nod to Salvato's previous work.
- Trolling Creator: The creator of the game made a joke tweet on Twitter that Natsuki was a trap. Some people took it literally and entirely missed that it was a joke, leading to the creator needing to step back in and clarify.
- What Could Have Been:
- A Skype conversation snippet shown in the art booklet for the game indicates that Dan considered Sayori being "the crazy one" before they shifted that characterization to Monika.
- According to a tweet by Dan Salvato, he originally wanted to release the game on April Fool's Day as the game was already a subversion of a dating sim. However, he felt like the game wasn't fully ready at that point.
- The Wiki Rule: DDLCWiki.ga and Doki Doki Literature Club! Wiki on Wikia.
- Word of God:
- The game's lead developer and writer, Dan Salvato, stated that it was born from his love-hate relationship with anime. In particular, he cited the "cute girls doing cute things" trope to be a double-edged sword.
- Additionally, considering his history as a competitive Super Smash Bros. player (plus his involvement in Project M), he even confirmed "mains" for each of the characters if each of the girls were to ever play Melee.
- Hilariously, Monika actually asks for tips on how to beat Marth, when, at the top, it's shown that Yuri mains him.
- Dan Salvato has also confirmed his distaste for the ''Trapsuki'' meme, considering it disrespectful that some people would constantly do it, even to confuse some people as well. Additionally, he himself has stated that "all characters are 18".
- Dan Salvato posted on his twitter that he disliked Gaia Online making a parody character of Monika (that was very non-transformative) and forcing players to pay for it. He stated his game was free and found it mind-boggling that they would force their players to pay to be able to buy a parody of the character.
Trivia / Doki Doki Literature Club!