Long hair (men)

Candidate was late.

Social media information.

Poor English language skills, i.e., grammar, spelling, on their résumé and grammar while speaking during the interview.

Tatoos.

I agree, social media information. But also, errors on resume, references that do not give a good report, basic hygiene problems.

Body odor, or wearing too much perfume/cologne.

Body piercings. Nose ring, eyebrow type ....

Not smiling during interview. Phone going off. Late for interview. Improperly attired. Weak handshake. (no handshakes today)

Poor attitude.

All of the above :)

So agree with social media info.

being late

I agree, Late!

Hair dyed crazy color