2
In the Commodore 64 version of the game, there are two known messages written with destroyable blocks that are hidden out-of-bounds in two levels of the game. In Level 1-1, the year "1989", referring to the year the game began development, can be found in the middle of the map. The other message is hidden in Level 1-3, where the letters "DTE" can be found in the middle of a land mass in the bottom-right corner of the map.
2
The Turrican soundtrack features two tracks that plagiarized the score of the 1986 film "The Transformers: The Movie". The title theme is directly based on the track "Escape", while the ending credits theme features a rearrangement of the track "Death of Optimus Prime".
1
After loading up the Commodore 64 version of the game and waiting until the title screen appears, going to address 8F40 with a memory viewer will reveal a hidden developer message. The message to discourage hackers from cracking the game is presumably from the game's creator Manfred Trenz, and reveals the date that the game began development:

"HI FOLKS, THE MANIAC IS BACK !!!
ONE QUESTION: WHY DO YOU WANT TO CRACK THIS PROGGY ???
CAN YOU IMAGINE HOW MUCH WORK I DID TO MAKE A GAME LIKE THIS ???

HERE SOME INFORMATIONS ABOUT: STARTING TIME: 01.02.1989 (OH YES)
ALL THE IDEAS,GAMEDESIGN,ALIENROUTINIES,GRAPHICS,PLAYBILITY,TECHNICAL
PROBLEMS AND MUCH MORE TOOK A LOT OF TIME AND WAS VERY OFTEN NERVE-RACKING!

ECHT AETZEND YOU WOULD SAY ...
SOMETIMES I WORKED MORE THEN 14 HOURS A DAY, ONLY INTERRUPTED BY ESSENTIAL
THINGS LIKE FOOD,COKE AND MTV.

I MADE THIS GAME NOT ONLY FOR TO EARN MONEY BUT NEVERTHELESS I'M SURE
YOU AGREE WITH ME, THAT I WANT TO EARN FOR MY WORK.

SO DO ME A FAVOUR AND DON'T CRACK AND SPREAD THIS GAME !! IF YOU HAVE
ANY QUESTIONS CALL: 0211/5280-0 BYE NOW AND THINK ABOUT !

PS.: DO YOU KNOW WHAT A GROELATZ IS ?? YOU BETTER DO NOT !"

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