I seem to recall hearing somewhere that the BDUs are supposed to never be ironed (hah!), and the tag on the uniform does say never ever dry clean (hah! hah!). That said, ironing and dry cleaning are both normal things to do with BDUs, at least in the Air Force (the Army and Marines have switched out BDUs for permanent-press uniforms that don’t need to be ironed to have a creased appearance, and the Air Force is also switching to such a uniform).
As far as cooking pizza, eh. If it’s getting turned into a smoking brown disc in the oven, the problem isn’t the instructions, it’s the cook. The instructions say that the pizza is done when the edges are golden brown and the cheese melted. They give you the time and temp as the best way they know of to get the pizza to that state, but if you ignore the last and most important step of the instructions, that’s your problem. 
Instructions from our sergeants at PT: “You should always PT as if you are doing an eval!” as in they want us to go balls-to-the-wall all the time for maximum physical improvement. I pace myself at PT because I have no idea how long the sergeants will have us out there, or how much of what we’ll be doing. When I do a PT eval, I push myself right up to the wall and through it. My feet hurt, my legs hurt, my chest wants to explode, but I know I only have to do it once and then I’m done with the eval until I’m due for another. If I PT’d like that all the time, I would die.
That said, I DO need to start working out a little more intensely, I got an eval in a few months. I think I’ll go for a run after I get off work.
Ooh, another one that I’ve heard: Don’t use a laptop computer on your lap, due to concerns with having a 100 degree piece of electronics sitting atop your gonads. Guess where my laptop is right now? Keeping my gonads nice and toasty on a cool day.
The “Five Mile An Hour Over Rule”. Not an official instruction (in fact, most official instructions indicate against this rule), but I’m horrible about almost never driving five over. I’ll tend to stick to the speed limit or slightly under, possibly because I almost never drive anywhere so I already feel like I’m just whooshing by at 30MPH. I am probably going to grow up to be one of those elderly slow drivers or something. Drives people nuts sometimes, but I’m more than happy to let them pass.
At the firing range I went to a few weeks ago, the instructions stated to be sure not to fire more than one shot every 3 seconds (basically, if you fire too fast, you can lose control of the gun and you might put a bullet in something important like the tracks for the target holders). I never pay much attention to how fast I’m shooting. I tend to shoot when I’m ready to shoot, but I’m not going John Woo on the range or anything stupid like that.
EDIT: re: lint traps. I clean them every time before and after using the dryer. When I was in Basic, they showed us some pictures of what used to be one squadron’s dryers after some trainees neglected to clean the lint trap after doing 50 guys’ laundry. Basically the whole laundry room went up and some guys got in big trouble.