No beard. Doesn't drink coffee. Well-spoken. Makes eye contact. Puts Oracle Certified on CV.
More seriously,
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?)
Its not necessarily a lack of talent (I think most things can be learned), but not having become good yet.