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: 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