"shaved head". Right there is the sign that you're bullshitting. Except for some South Indian temple employees and possibly elders who came over with their grandchildren nobody does that (and believe me I've looked for them.)

Now tilaka etc. Slightly more likely but bear in mind (I presume you are North Indian based on your spelling of janoi am I right?) in many places vegetarianism isn't an absolute norm even amongst Brahmans. Also I would presume purely as a matter of sociology vegetarianism would be one of the distinctive features least likely to go because it is something increasingly fashionable in the larger community whereas janoi etc. are not.