Corrected entry: Tanks do not have cassette tape players, therefore Burns couldn't play his revenge tape before he tried to arrest Mona. (00:19:55)
Corrected entry: When it goes back to the sixties and Mona Simpson is setting the bomb, there are 8 hippies around the bomb. When it cuts to the news bulletin about the lab, Kent Brockman says there were seven.
Correction: The only people who knew about it were Clancy Wiggum and Mr Burns, and both could have believed it was seven and not eight people in the lab. Like any news media outlet, sometimes they get the facts wrong.
Lummie
Correction: Burns is filthy rich, and could easily have payed to have a cassette deck installed, seeing how he had always wanted to play Ride of the Valkyries while riding a tank into battle. It is of course a spoof of "Apocalypse Now", where helicopters were fitted with tape players and loudspeakers blasting the same music.
Twotall