Dairyground, your Boeing captain was not intimitely knowledgeable of the Airbus, of course he would read the safety brief the same was as I would.
As for seat numbers, you give the great travelling public far too much credence for mathematical ability in this age of calculators and automatic tills.
How many times have you boarded an aircraft at the tail but had to disembark at the front? On several occasions I have had passengers barge their way past me to get to the tail despite being told it is closed.
In an emergency these passengers will not act rationally but head for where THEY think the nearest exit is and you can be pretty sure that th eone in the row in front of the overwing will head forward and one a couple of row back may go either way.