I also have a Hybrid Tahoe. Those came with a big "HYBRID" lettering on the doors and the typical hybrid badges on the fenders and tailgate.
I noticed that on my '13 MKZ, the only way anyone can tell it's a hybrid is the "2.0H" on the trunk lid. I get that many people hate that badging, and in the case of the Tahoe, many remove the huge lettering immediately. Some remove all the Hybrid badges. I've heard that having the green leaf badging can help Fire/Rescue in the event of an accident keep from accidentally cutting through high voltage lines.
So did the MKZ come with any other badging? Honestly, when I went to the dealer to find this car, I couldn't tell which one was they hybrid. Didn't know to look for the "2.0H", but that's what finally helped me pick it out.