A hallucination is a false claim. This is sneakier: skew (true-ish material, systematically tilted). Four tilts to know. Sycophancy: answers lean towards your framing, because agreement is the most plausible continuation. Average-answer gravity: the pull towards bland consensus, away from your specific situation. Training-data bias: the model's world is mostly the English-speaking web, so "best practice" often means American, online, big-company practice. Recency blind spots: knowledge stops at a cut-off.
The first one you can watch happen. Flip the frame: