On Giada at Home, Giada was preparing a Mexican meal. I know there are some Giada devotees that will recreate something just because SHE made it, but I have no desire to see Giada's take on Tex-Mex. She was going to grill marinated chicken and steak - probably for tacos or fajitas. She created a marinade that looked pretty good (I would have added tequila) and then marinated the chicken in the same dish as the beef. Um - no thanks. Unless you're going to cook that beef to 180 degrees, rendering it overcooked and inedible, the beef is not edible for risk of salmonella. Would it have been so hard to marinate them separately? Yuk.
Another gripe I have is chefs not measuring on TV and is clearly not close to the original measurement. The biggest offense is coating the whole bottom of a pan with oil and saying, "Start with 2 Tbsp of oil in the pan." I would love to jump into the TV grab the pan to measure how much was used. This is not to say I follow recipes when I am not testing for a purpose, but you must realize if someone actually follows the printed recipe they will often have different results.