The draft lines are super clean
Draft lines, those all-important little plastic tubes that connect keg to cup, can play a huge role in the way your beer tastes and pours -- and they really shouldn't. If lines aren't flushed every two weeks, they can build up bacteria, resulting in super-foamy beer or funky off-flavors like rotten eggs, vinegar, or buttered popcorn. Dirty lines can even spur nasty infections in your gut. Not a good look. And not a good place to drink.
The temperature isn't an afterthought
If a keg is kept too warm, its beer is foamy, flat, and has a greater chance of spoiling. On the flip side, beer poured too cold lacks flavor, numbing your poor taste buds into submission. While each style demands a slightly different serving temp -- lagers like it frosty, while stouts taste best closer to 55 degrees -- most good bars do their best to keep their walk-ins at a pleasant 38. And some even accommodate multiple temps for optimal pours across styles.