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No beard. Doesn't drink coffee. Well-spoken. Makes eye contact. Puts Oracle Certified on CV.

More seriously,

• Cannot solve intermediate problems. No need for advanced algorithms or kernel hacking, but FizzBuzz is too low a bar.
• Cannot explain the code he writes in some depth.

• Doesn't know language fundamentals, e.g. (Python)

  x = 2
  def f(x):
      return x + 1
  f(x)
  print(x)
  

• No attention for detail (same example maybe?)

• Doesn't follow good programming conventions.
• Overconfident (in code, e.g. by not testing, or in views, e.g. by being wrong loudly).

Its not necessarily a lack of talent (I think most things can be learned), but not having become good yet.