Yes, the Whitehouse has a calligrapher. For lots of things that require formal presentations, but also for things like name cards at state dinners (the same as one might do at a fancy wedding reception).
The government doesn't want you to know that but actually the Queen didn't die, she just decided it's finally time to retire and moved where she figured no one would look for her. After the unpaid intern accidentally leaked the information - hence the rooms name on the map - that fact is still denied, which just makes it more suspicious.
The conspicuously missing area under the oval office is the president's evacuation/bomb shelter area with underground connections to the various tunnels used by the Secret Service to move around in secret (or just in a hurry).
Supposedly the tunnels under there connect pretty damned far. It's like... The forbidden tour haha.
