Some of my favorites (Sorry if theyre doubles, I only had time to read 30 or so pages)
-Utility companies report any unusually high usage to the authorities. (only true if you are stealing it, otherwise you really think they want to risk getting LESS money from you? Puhlease!!)
-48 hours of darkness before harvest causes the buds to swell. (Absolute horseshit, I have tried it with and without on multiple strains under the same conditions otherwise.)
-CFLs dont get hot. (In fact, per watt they get HOTTER than the average HID considering the ballast for a CFL is connected to the bulb whereas most HID users use a remote ballast.)
-Growing in a Rubbermaid or cardboard box is safe. (I dont care how broke you are, there is no excuse for combining high heat and plastic/cardboard to save a few bucks. Especially when you are already risking a lot by growing period. Every Rubbermaid or Cardboard contraption Ive seen is an inevitable fire waiting to happen. Most people upgrade soon with good reason.)
All I can think of now, so many thousands more. The main thing you have to realize is there are 2 sides to every story. Like with "plants wont grow over 90F", this is somewhat true indoors unless you are pumping in C02. Outdoors they have an abundance of C02 no matter the temp, indoors there is less and high heat causes all plants to "breathe" slower, taking in less C02. Over 90F will still grow plants indoors, just very slow compared to a perfect 76-78F.
A lot of other situations are like this, and people only take away a one sided approach because they are too lazy to read into it for themselves. By the way, Ed Rosenthal's MJ Grower's Handbook is the most fantastic piece of modern literature when it comes to any and all of these subjects, and then some.
KB