Recently interviewed with a startup, and during the process via email, I was constantly communicating with different people. After the 3rd interview with the CTO, I thought they ghosted me and emailed the last interviewer and got no response. Over a week later the director of engineering emailed me to schedule the 3rd interview with the CTO. I immediately knew that they had internal communication issues and decided I wasn't going to pursue the role further.

My current role has a somewhat misleading title, but to offset that I make sure I really highlight my experience and the projects I've worked on. If an interviewer starts asking me about my title and why I'm applying for something more 'generic' I immediately know they didn't read my resume or pay attention and I'm out.

Years ago I walked out of an all day interview, maybe 2 hours in, because one of the engineers was on his phone the entire time, seemingly just scrolling and not paying attention.