One of the most common errors I see among the professional writers I edit is stuff like this:
Sandwich selections include, ham, tuna, turkey, peanut butter and jelly.
The store carries apparel, shoes, accessories, housewares, electronics, as well as small appliances.
Unless someone's serving jelly sandwiches with no peanut butter, both these sentences contain faulty parallels. Here's what you need to know about this common mistake.