Apple II software frequently saved
data onto the actual disk the program was sold on, which is a
terrible practice. The
side effect of this is any
disk image you take of an Apple II
program will have whatever old data or
high score that has been stored there as well.
The only disk image of Oregon Trail for the Apple II I've found appears to have been put to actual use in a real live school or home. The game has an unusual feature, where if you die it will ask you "What do you want on your Tombstone?" Then anyone who plays the game after you and passes your grave will see your final resting place, complete with your epitaph. The disk image I played in an emulator, apparently some wise ass kid played on a real Apple II. His answer to "What do you want on your Tombstone?"
"Pepparony and chease." (misspelling is his, not mine)