yep... there are 2 lights on the pax door .. one for cabin pressure and the other for slide armed.
the cabin pressure on ground might light momentarily but there is no danger as the aircraft should already be at ambient pressure on ground by means of the outflow valve fully opening.
as for the door slide on the a320 the light warns that slide is armed for the operator inside... if they continue to open it then the slide will deploy.
as for the opeing the door from the outside... well airbus figured that if u are able to open the door from the outside then there is no need for the slide
. ... so the slide automatically disconnects from the door fitting when opened from the outside!!!