The number one issue with both company's care sheets for amphibians, and many lizards, is dietary suggestions. Recommending meal worms and wax worms as staple diets is bad news all the way around.
The second most common error is temperature and lighting. While I understand the requirements for each species differs greatly; 80 F with a UVB incandescent bulb for amphibians is just too much bad information on one page to bear.
The third and most glaring error to a self proclaimed exotic pet snob like myself is incorrect, misspelled, or missing scientific names. To me this is the worst error of all as it results in complete failure should a novice herptile owner decide to try and research husbandry and care information.

Now in PetCo and PetSmart's defense, there are innumerable momNpop shops that are just as bad if not worse.

Also, I have yet to meet an employee of either store, anywhere in the country that was not eager to learn proper information about the animals in stock. This is one of the very few reasons I frequent both companies here in the Omaha area. (Well, that and I can take my pugs with me and the manager of one of the stores bent over backwards to get the volume products I need but cannot have shipped in winter.)