Asking the same question to every role
A "great question" borrowed from another team may miss your role entirely. Questions should probe the signals that matter for this specific job, not impress in the abstract.
No rubric, so scoring is inconsistent
Without a rubric, two interviewers can score the same answer differently. A one-line note on what a strong answer includes fixes most of that drift.
Leading or yes/no questions
"Don't you think X is best?" invites agreement, not signal. Closed questions end the conversation early. Open questions that ask for a specific example reveal more.
Unintended bias in phrasing
Some phrasing can surface protected-class information or assume a particular background. Bias-aware framing reduces this, but it is a preparation aid, not a compliance guarantee — review the set yourself.
Skipping seniority tuning
The same question at Junior and Lead tests different things. Tuning to level keeps the bar fair and appropriate, rather than accidentally over- or under-testing.