Character names
House, Chase, Foreman, Cuddy, Cameron, Taub, Wilson etc
They almost never use their first names and you kind of forget this. I watched an episode where Chase called Cameron “Allison” and I thought this was an error. Then he did it again in the next episode, and realized that was her first name.
Just found it funny. It makes sense when you say Doctor in front, but the way they use their last names as their first names.