Little RTD things: the way every companion introductory episode includes a person of color who is explicitly rejected as not good enough.
As much as I blame RTD for this, I also sort of blame the entire team of producers/editors/assistants etc for not noticing.
(I’m also kinda annoyed that they thought a brilliant way of presenting Ten to a new audience was to have him ignore and insult a distressed, crying woman. And that a year later, they thought it would be a brilliant joke to have Penny, who did more work than Donna when it came to the plot, written off for being a journalist – “You’re a journalist? Make it up!” – when Sarah Jane exists.)