They don't look for bikes or think to look to their left for pedestrians when they are backing up.

They don't look to the right when making a right turn, only left.

They don't see crosswalks or believe they have to stop just because someone is in one.

They don't believe a cyclist they drove by 2 seconds ago will be in their path when they make that right turn....a school bus almost got me doing that a few days ago.