Also left unmentioned, but having done a few interviews....
Simple hygiene is sadly frequently overlooked. We'll be sitting face-to-face and three feet apart: Shower with soap, use deodorant, wash and brush your hair, brush your teeth, use mouthwash, wash your hands with soap again before entering the office, and suck on few breath mints before entering the office. Again in all caps: NEVER REJECT AN OFFER OF BREATH MINTS OR STRONG-SCENTED CHEWING GUM. It is not a secret hidden agenda to see if you prefer spearmint or peppermint. If I offer you some chewing gum or a breath mint during the interview, assume it is because your breath (or possibly some other part of you) stinks and I am giving you a polite way to fix it, or at least mask it. Take me up on that offer.
Simple appearance is sadly too frequently overlooked. We are a casual industry. Usually a CLEAN, UNWRINKLED, hole-free t-shirt, CLEAN shorts or pants that aren't threadbare or holey, CLEAN plain socks and REASONABLY CARED FOR casual shoes are okay. I've seen too many shirts and shorts that were covered in heaven-knows-what. Flip-flops may be okay when you've worked here a while, but not for an interview. Stinky shoes don't cut it, buy some odor eaters or a new pair prior to the interview. Also wear clothes that don't smell like you live in the gutter or smoke. Most offices are smoke-free environments, so just don't.
When I see smears of gray goo on a shirt, or a badly stained t-shirt that should have been thrown out last decade, or brown goo on a pant leg (or rump), or if you stink, or if I feel the need to wash my hands after shaking yours, sorry, you go to the 'no hire' pile no matter what your technical abilities were.
You are probably good on those, and I wish they were obvious to everyone, but that really happens. So don't do that.
At my last company we literally kept cans of floral-scented Lysol in the interview rooms. The industry is casual in that we don't wear business suits. It is still an office environment.
Beyond that, I don't feel like there is much to cram for when it comes to a technical interview. Good interviewers are perfectly able to ask you questions and dig down deeply until they hit the edge of your knowledge. Either you have the technical knowledge and abilities they want, or you don't. It is okay to say "I'd need to look that up, but I think it is such-and-such", but ultimately they will quickly discover if it is something you know, something you need a little refresher on, or something you are clueless about.
Hiring someone is a two-way street, you need to know a few things about the company just like they want to know about you. Do some research about the company, be prepared with a few questions and notes about the studio you may have. No need to cram and memorize them, you can ask questions read from a sheet of paper if you prefer; I'm totally fine with that since I'd hate for you to forget to ask something that you felt was important.
Just be yourself. That's all they want to see.