Salamanca is a heavily visited city and so there are typical tourist related crimes to watch out for. You are likely to run into scammers here and the most common ones are credit card and ATM scams. Be careful when getting your money out of ATMs, check there are no attachments or hidden cameras. Double check your change and never pay anything upfront. When in doubt, go to official websites and kiosks for buying tickets and any general information.
Be wary of so-called ‘trileros’ playing the “shell game”. Watch from a distance but they will probably rip you off you if you play.