Oh this is a great thread; I could go indefinitely on this one. Offhand, these are the ones I remember:
1. Couldn't watch the Speedracer cartoon, because in the theme song, it said he was a "demon on wheels".
2. Couldn't watch Scooby Doo or Casper "the friendly ghost" - demonic overtones.
3. The phrase "good luck" was ABSOLUTELY forbidden
4. To say "Bless you" or "gazundhite" after someone sneezed was wrong.
5. All button shirts had to be buttoned to the top button, lest someone would get the wrong idea and be stumbled.
6. No slang, EVER.
7. Couldn't listen to the song "Marina Del Rey" by George Strait because it allegedly referred to fornication.
8. Any music over two decibels or that had a beat was off limits; I was made to remove my car radio as a teenager, and frequently had entire collections of "hard rock" tapes confiscated. Man, I got tired of buying the same tapes over and over.
9. No posters of anything other than landscapes, lest I would be "idolizing" a person or thing. (No celebrities or cars)
10. Could not use the words: Gosh, Gee, Golly, because they were subtle references to the Lord's name, and defintely couldn't say darn or dadgummit as they could be mistaken for profanity.
There are a trillion more...they'll come to me. :)