I've found that while you can't accurately gauge how a work environment will feel to you by the interview, the biggest sign that a workplace is going to be toxic is deception or double-crossing in the hiring process.

Places are unpleasant to work in because the people in them are unpleasant, and unpleasant people treat each other badly.

If the compensation in the job offer is lower (even just a little bit) than what we discussed, or if the job title is different, hard pass.