I belatedly discovered [very belatedly] that the original dos Nascar Racing 1 and Indycar Racing can be played in a higher-res mode simply by running the exe with a -h switch. Very nice little enhancements I'd totally missed first time around.

Most of the oldies make it pretty clear during Setup.exe or Install.exe what possible modes there are - but there must be other games out there with 'easter eggs' similar to NR/ICR - not so obvious switches to add greater res or detail - anyone add to the list?