ZFR: Here is another common one:
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"Insert word X from line Y from page Z" copy protection. At best, it was tiresome even if you were the rightful owner and had the manual. At worst, it could make game completely unplayable if you misplaced the manual or your dog ate it. Without the internet you had to look for a manual among your friends, or write to the publisher for a replacement. Makes some of contemporary DRM very mild in comparison.
fr33kSh0w2012: See there has ALWAYS been DRM!
Copy Protection & history by LGR - Seriously, watch the whole thing :P
chadjenofsky: Unforgiving adventure games. You miss one little thing in the beginning and end up wandering aimlessly through a great bit of it not knowing it was all a dead end.
Also:
]INSERT DISK 2... PRESS KEY TO CONTINUE
Brrrr Chunka Chunka Chunka Brrrr... Chunka ]INSERT DISK 1... PRESS KEY TO CONTINUE
Gahhhhh!!!!
Some of the older 8-bit adventure games had this problem a bit. I remember trying to play one on an atari emulator, 4 disks...
Walk around
YOU ENTER A FIGHT! - Insert disk 3 -
... Yeah... those could quickly get annoying. Questron had 2 disks and some areas needed the second disk, other than that most of it played on one disk, making it a minor annoyance most of the time.