Visually: What's the environment look like? Do you see anybody laughing and having a good time, or is everyone's head down into their desk and not looking up? Are the machines old? Are the work environments nice (even if dated) etc. Look at how many layers of management there are.
BTW -- any awkward pauses on the questions or doubts on the visual and you already have an answer.
Ask if they're remote friendly.
Ask what their sick policy is.
Ask what their company does to make the world a better place. It's fine if they don't have an answer, some entities exist just to make money without any other "mission", it's just good to know.
For some people that's vacation, for others it's safety nets, and for others it's engineering processes. Only you know what matters to yourself.
I agree that there should be coding standards, but perhaps I should have been more clear: it is common for shops that care a great deal about code formatting, not to care - perhaps not to even know - about coding standards which can avoid bugs.
I had in mind specifically one shop that was very, very picky about its comments, but no one other than I had so much as heard of a C++ smart pointer.