Ok, so from memory...
Worms code sheet - faint silverish lettering on a shiny black card thing.
F19 Stealth Fighter - Identify this plane from 20 - 30 blinking drawings!
JetStrike - page 1, paragraph 78, 3rd sentence, word 3
Argh, so what was the most annoying form of copy protection you came across for those of us who bought the genuine article of course