[darkandbrooding]

I won't presume to answer for the OP, but my (remote conference attendance) pet peeves include: I have printed out important information (but forgotten to email it); let me use the whiteboard that is mounted on the same wall as the camera to illustrate a concept; I will speak exactly loud enough so that only people in the room can here me; I will use the free tier of some conferencing service, and start the call fifteen minutes early so that the connection drops halfway through the meeting.

[mattferderer]

Well said. The biggest offenders are usually companies & not the remote employees. I am in a great spot where I don't experience these today but the most frequent I've seen are:

Poor microphones set up around the conference room that make it hard to hear everyone.

No webcam at all or a bad webcam setup that doesn't allow the remote attendees to see the gestures people make.

Multiple people talking at the same time, but having very quiet conversations.

Using a whiteboard, a projector or showing a screen by turning your computer around but not making it visible to remote attendees.

* Basically doing things that the remote people can't participate in.

[alistairSH]

A few years ago, I was on a green-field project and one of the senior developers was remote. The rest of us were co-located in a "lab" (converted conference room). While our teleconferencing tools were mostly adequate, white-boarding was problematic. "Smart boards" aren't usually. We ended up with an extra webcam pointed at the board and just had to remember to plug it into whoever's laptop was leading the meeting. Not ideal, but worked ok.