What are subtle red flags at jobs that you wouldn’t notice until a month of a while at the job?

I am curious of other people experience or perspective on subtle red flags you will not notice right away when initially starting a new job. Or would not notice unless someone who spent time working there points it out to you. Sometimes we notice certain things especially with lack of experience, when we have been in certain places for quite some time so I am curious what you all have to say. Thanks and be at peace!