Solid read. I am a sloppy 260ish lb powerlifter, and I think the begennin of the end for me was the monotony of chicken rice brocolli fish repeat. I actually won a transformation contest at the old SSB eating nothing but this for about 10 wks. I stayed pretty for about a yr and a half and over the past three I ballooned up from 210 and sinlgle digit bf to over 300 at one point last year.
Ive been guilty of most of these mistakes over the past year-despite that - I got about 50 lbs gone and about 40 more to go to get back to the 220's and not look like doo-doo.
Eliminating these mistakes are hard because of the massive dedication it requires. It takes a long time just to understand what you are really trying to acomplish and takes multiple trial and error "experiments" to fine tune your physique. These ten errors can take 10 years to eliminate. Heck, it could take your whole lifetime. Keep in mind though, that ultimately eliminating these mistakes will be one of your most rewarding achievments.
2. Failing to Accurately track calories
Be sure to count not only calories but carbohydrates, proteins and fats as well. Because they don't keep a record of what they're eating, many bodybuilders don't lose fat at the rate they expect, while others fail to gain weight. Don't make the mistake of miscalculating your calorie intake. Successful bodybuilders keep precise records; they don't guess or estimate. Consult the Nutrition Almanac or a comparable source for food values and buy a scale.
This is the big one. I see so many estimations on forums that just seem rediculous to me, this goes both ways too. People grossly exxagerate calories from what I say. Get a scale and an accurate nutrtion tracker.