OK, so alien invasions - not a problem.
Humanoid with two hearts called a Time Lord regenerates from male to female - not a problem.
Teleportation into space using devices cobbled together in backstreet Sheffield workshop - not a problem.
Train might be shown with the wrong type of locomotive - BIG PROBLEM.
Always such a funny thread when people pick over the detail on such programmes. It's fiction, it has to be filmed somewhere within reasonable budget and accessibility, and, oh, did I mention, IT'S FICTION.