The most famous processor bug in the famous Mostech 6502
processor is the bug that hinders indirect jumping. This bug is
apparently also present in newer incarnations of 6502 for bug-for-bug compatibility.
6502 has indirect jump operation. It's expressed as JMP (address),
so JMP ($C000) would first fetch the target address from $C000 (low
byte) and $C001 (high byte), then jump to that address.
However, 6502 is buggy what comes to page boundary: if we were
to do JMP ($C0FF), the high byte will not be fetched from
$C100 as expected, but from $C000!
So, beware of the edges of the pages, lest you get
cuts to your fingers...