Stuff I always check
Refried Beans sometimes contain lard. Read the label!
Also, I never get soup out anywhere without asking if it's made with meat stock. Most are. And I don't always believe them when they tell me it's not.
The Weight Watchers frozen foods almost all contain chicken fat or broth. People think I'm crazy when I start yelling in the frozen food aisle, "Why do you have to ruin a perfectly good vegetarian entree with meat products!"
Very frustrating. Making your own food is always safest.