Gedon:
It doesn't count up continuously anymore, and counts up respectively to what coin is inserted. Still starting from 0 and not 1 would be a bit more of a convenience to me than finding a way to get rid of the unnecessary 1 on start.
From that page:
Something to be aware of is that these flags can be set before you attach the interrupt handler.
Before the attachInterrupt, try:
EIFR = _BV (INTF0); // clear flag for interrupt 0
EIFR = _BV (INTF1); // clear flag for interrupt 1