1) You need to eat six meals per day.
2) Nutrient combining (eg, fats and protein or carbs and protein at meals only)
3) Carbs at night are bad.
4) Bodybuilders wrote their own articles.
5) Bulking up leads to quicker muscular gains.
6) Top pro bodybuilders and all gurus are loaded (eg, Shawn Ray standing in front of mansions in magazines, Flex Wheeler leaning on luxury cars, Trevor Smith boasting about his business when he didn't have much money)
7) Supplement claims of all sorts.

One can gain 20 or more pounds of muscle in a single season.
9) Ernie Taylor's triceps were all muscle.
10) I thought that Ronnie Coleman actually did regular police work with his 300 pound body that had to be fed every few hours and that couldn't wear a bullet proof vest.
11) I thought the claims that every other pro was headed to the NFL until they got a career ending injury and then during rehab, fell in love with the weights, and from then decided to set their sights on becoming an IFBB pro. I heard this goddamn story over and over.
12) Different carbs had different effects on body composition, even when kept constant (eg, brown rice is "better" than white rice).