One additional thing to watch out for is additional documents that are presented for your signature after you start work. One place gave me an employee handbook

One additional thing to watch out for is additional documents that are presented for your signature after you start work. One place gave me an employee handbook on day one and asked me to sign something saying I agreed to follow the terms in it. I could have said no, but obviously I had much less bargaining power at that point. Since then, before accepting an offer I always said, "I'd also like to see any documents that I will be expected to sign on the first day of work, or any employee handbook whose policies I will be expected to follow."