Goldeneye 64 - Trevelan doesn't move (on caverns)

Usually on this level as soon as you leave the elevator trevlan runs away immediately, however if you have invisibility on he will stay there and the doors that usually close will stay open. If you shoot trevlan he will act like he got shot but will never die.

Goldeneye 64- shoot people through doors

If you are ever on the opposite side of a door as an enemy and the enemy is trying to get to you, lots of times either their arms or heads will stick through the door allowing you to shoot them.

Goldeneye 64 - Kill the General

On the Facility level, after you talk to 006, get either the golden gun or the golden pp7.

now you can run up and kill the General with the golden gun, which will make 006 keep fighting the bad guys, or you can wait until he holds 006 hostage and he will stay that way.

Goldeneye 64 - Floating bond

To do this you will need the tiny bond cheat.

Find a staircase and duck down with the cheat on and then walk down the staircase.
If done correctly you will walk forward but not down.

This can be used to walk through walls too in levels like the Frigate and the Dam