imaginable. You'd imagine that, having decided to go to the trouble of filming a recipe, the chefs in question would ensure that they have a clue about what they're doing. This is rarely the case.
Most frequent is the misuse of olive oil. I've just watched someone heat a frying pan until it's smoking hot, then pour in a tablespoon of olive oil, which of course immediately became burned and bitter, but better still, the **** then added a load of garlic, which instantly... you know the score.
It was easy to learn to cook, back in the day. You did what Delia told you, and Delia never gave you a bum steer. These days I pity anyone trying to learn from tinternet. It's full of charlatans.