In Australia our labelling is a bit more specific (thank goodness). Very few things are zero
Our nutritional data is per serving then per 100g(mls). The 100g(mls) is for comparative value - all items must have.
So companies are unable to fudge their serving size results.
For instance Hellman's Mayo (called Good Foods here) has a serving size of 14g/0.2carbs in Australia, but in the States it's zero. Our cream also is not zero, nor our bacon, everything has some sort of carbs. Things add up quick.
Eggs vary in size and believe it or not, when you buy a dozen or half - carbs are different. Average size are about 0.7c, but go up if much larger. Never get caught out - always read the label, even if you have bought the same thing over and over. Companies like to change things without warning - we've all been caught out.
Oh - welcome to the forum too