It's fun seeing how deeply some actors get into the role by doing stuff like this. A common one (for men) is to make up a wallet. Even, or especially, if it is not used on camera. It's the kind of thing that says a lot about your life, and is actually carried around, so populating it with the cards and ticket stubs and receipts of your character helps you get into it.
As shown here, no one else much cared about the workings of the set, but he'd gotten into it enough to know that the TARDIS was his home, and almost a character. He can't fake it every time, so verisimilitude (continuity is just a side effect) is important.
Assuming it's true. Could be a writer who knows about the craft of acting embellishing. But it rings true.
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