When Brent had caffeine withdrawal when giving up coffee, why didn't he drink Coke or energy drinks? The bet explicitly banned coffee, not caffeine.
In "Whataphobia," Wanda is asked what she fears, and she can't think of anything. But we already know from "Oh, Baby" that she has a serious fear of dentists. She won't even consider making a dental appointment unless she has an excruciatingly painful toothache, and even then she needs some convincing.