I have a lot to pick about the M&Ms commercial: first; an indicates one of something, usually a something beginning with a vowel. An eraser. An analogy. An idiot. So there's grammatical error #1. Next, as mentioned before, an indicates one, therefore, An M&Ms (plural) is wrong. A tasty pretzel shoved inside a M&M, or A tasty pretzel shoved inside M&Ms.
Who proofreads or edits these things? Shouldn't they be smarter than the Average Joe, or are they trying to dumb it down?