The Last and Final Call

I was at the airport the other day and found myself listening to the announcements that were being made for other flights.
"Bong Bing, this it the final call for flight BMX500 to Scunthorpe, would all remaining passengers please go immediately to gate 24"
Fair enough, nothing wrong with that.
Then 3 minutes later - "Bong Bing, this is the last and final call for the last remaining passengers on BMX500 ....... " Nope, I can't take that, we just had the final call so by its very definition there won't be another call.
Yet there were a further 4 calls which got worse. "Bong Bong (OK Ill stop that bit now, take it as there) "This is the final call for the last remaining passenger Miss Dit on flight BMX500 please go to gate 24 where your gate is closing and your flight is awaiting an immediate on time departure"
Now I am not sure which part of that one annoyed me the most, we are still having final calls and they just said it was an immediate departure so that means, well immediate, so if they are waiting for the woman then its not going to be departing immediately and probably not on time, is it.
If people don't know that once they have checked-in at an airport they have to actually go and get on a place you have to wonder if they should be allowed on anyway. If they need to be called 4 times then just maybe it would be safer to leave them behind, because you only get the safety briefing once and I could be depending upon Miss Dit to remember to keep walking in the direction of the lights until she comes to an exit. I certainly hope not.