Carlisle goal v Notts | Vital Football

Carlisle goal v Notts

I haven’t seen anything like this since Gaz Crosby headed out of Andy Dibble’s hands at Florest, although that should’ve been disallowed obviously ?
 
At no point in the video clip was the Carlisle player off the pitch.

Yep it looks like he stayed on the line so there's absolutely nothing wrong with the goal.

Even if he was off the pitch before the clip started I'm not 100% sure what the rules are. Surely players leave the pitch loads of times during the game, is specific permission required/given each and every time?
 
You would think with the Pantomime Season in full swing at County someone would have shouted to the keeper,

"he's behind you" ..... "oh yes he is" .... "oh yeah"