- Awesome Music: The DVD for .hack//SIGN gives the option to turn off dialogue and leave only the music. Considering that said music was made by Yuki Kajiura, did you really expect anything less?
- All the games feature great music by Chikayo Fukuda and the wailing vocalist Tomoyo Mitani performs the Tear Jerker song to close out the the first two G.U. games plus the awesome third song. She also did the vocals for Aura's theme in the first game and more. To top it off .hack//Link also features a few of Kajiura's songs.
- Memetic Mutation: The Monkey Dance.
- "This shindig looks like the bomb-diggity."
- Considering B.T. frequently has chats with Sora, she was killed by him a few times in the game, and attacked by two player killers in a dungeon. This eventually becomes a joke in .hack//GIFT, where absolutely no one is surprised to see that B.T. was murdered yet again.
- For about a decade, all you had to do is yell out "I'm stuck in the game!" or "I can't log out!" around anyone who has seen this show, especially in an MMORPG, to spark laughter, or joining in. Nowadays, it's been co-opted by a different franchise.
- Broken Base:
- Some fans prefer to think of Tsukasa as a boy, as although he accepts that he is female in real life, he doesn't hate his male identity that much and Subaru doesn't care what gender he is anyway, while others tend to just think of him as a girl, like in real life; others still think of him as nonbinary. There has been quite some debates about this, but most decide to go for a simple solution: referring to his player, An, as female, and Tsukasa the character as male.
- Is .hack//SIGN or Sword Art Online better? However, many people tend to lean toward this show, due to it developing the inner thoughts of the characters better. Others consider the two series too different to even compare.
- Hilarious in Hindsight: This wouldn't be the only time Mitsuki Saiga voiced a character in a video game franchise whose true gender isn't what we thought initially, though Hibiki's personality and mannerisms are very different from Tsukasa's.
- It Was His Sled: The fact that Tsukasa's player is a girl is not that much a secret nowadays anymore.
- Viewer Gender Confusion: Macha is a girl. Though due to the lack of any clear feminine characteristics outside of being part purple, it's next to impossible to tell from watching the show alone. She has no voice either. (This is explained in tie in novels to be because she comunicates entirely via text, which in-universe players can see, but the viewer cannot.) In the original Japanese version she has one voiced line because she vocally screams in a woman's voice when she's killed. This one line is left unvoiced in the dubbed version. It's only during .hack where she has a much more human and feminine model that actually speaks with a female voice that one would know.
- The Woobie / Jerkass Woobie: Subaru and Tsukasa, the latter's "jerkass" status depending on the portion of the series that you're looking at.
YMMV / .hack//SIGN