1. Audio, audio, audio... It doesn't matter how good or good looking you are if I can't understand any of your eloquence. Using microphone on your phone or webcam may or may not be adequate, you should test this. There is test call functionality in almost every web conferencing software.
In general having microphone close to your mouth and distant from any noises is safest choice. Headsets are cheap and effective.
Also turn off any feature that changes volume dynamically, this can cause volume to change suddenly to painful levels. For example zoom can pick up distant voice and increase volume suddenly. As an interviewer I am already setting the volume as high as I can before it becomes uncomfortable because I don't want to miss anything you say, having the volume change suddenly makes my life this much more difficult.
2. Just because it is remote interview doesn't mean savoir vivre is out the window. Be on time. Don't interrupt. Don't insult the interviewer (yes, I had this happen to me recently).
3. Don't be obvious looking up answers to my technical questions on the internet. And if you need to google something, try to put it in your words rather than read word by word, because maybe I can do the search myself, too. Yes, this also happened to me recently.
4. Make sure you have peace and quiet for the duration of the interview, before the interview and also some margin after. Set the time aside and remove any distractions. Try not to create perception you have something more important to do. It doesn't look good if are jumping from one meeting to the interview to another meeting.