HAAN!! 
cakes with fruit toppings are almost always glazed in gelatin (you can look for bakeries that use pectin glaze instead). cakes like black forest have rum in the fruit for flavour. some bakeries use lard to mix with the flour. best thing to do is to find a halal bakery or at least a kosher one. best bet is to find one that is vegetarian friendly.
ottawa had a halal one but there isnt one where i am right now. soooooo sad… 
the more i look around, my options seem to get lesser and lesser. its frustrating as hell but at least its better than consuming the non-halal stuff in ignorance. beware of things like shrimp dumplings too. they use lard 99% of the time for the dough.