As Doctor Who enters its 8th season, there are aspects of the old show that weren’t carried over to the reboot:
Explicit TARDIS hum
The reboot has subtle ambient sounds, witness:
Do you recognize that sound from the reboot? Maybe if you listen with noise canceling headphones on. The old series had the following, mixed so it was noticeable, but didn’t interfere with dialog:
Companions having their own rooms in the Tardis
I admit that this was something introduced during the John Nathan Turner era, but with the budget given to the new reboot, I’d expect this kind of thing.