Let's start out with the Picture of the people in the Tavern, List as many details as you can in the pictures and I will update this the more and more people post things they notice which will help others maybe notice something they hadn't before incase we missed some stuff........ here we go.
http://www.elderscrolls.com/skyrim/media/screenshots/tavern/
-The Tavern may be in Riverwood
-Older Characters bodies look more winkled and younger more smooth as well as their facial features.
-Things on the back wall seem to be casting shadows
-Slaughter-fish mounted on the wall
-Drinks and potions have different shapes
-Mammoths tusk on the top shelf
-Some pieces of cheese
-The merchant on the left is selling Drinks (maybe potions) and the merchant on the right is selling Foods.
-Female Merchant is sweeping the floor with a broom
-The NPC sitting to the very left is a Bosmer.
-The mounted elk/deer head on the wall is very large and has two birds are adjacent to it.
-Very unique clothing items from the various NPCs
-The man sitting at the bar on the far left is both sitting and resting his arms on the counter.
-The Man on the left and the bartender appear to be conversing the way you would expect a bar tender and a customer to converse.
-The men appear muscular and the women look more feminine.
-Dragon teeth act as the light fixture.