“You can’t do this. You cannot pretend to be an actual person among real people.”
When an episodic TV series has been running (on and off) for fifty years, it’s hardly surprising that some episodes instil a feeling of déjà vu. Terry Nation, notoriously, wrote the first Dalek story again several times, changing a few names and locations but keeping the same basic plot. That same feeling of déjà vu was very much present in The Caretaker. The concept of the Doctor trying (and comically failing) to fit in with everyday life on contemporary Earth has become a bit of a trope in recent years, most notably in the work of Gareth Roberts, who set the template with The Lodger and revisited it with Closing Time.