You have no liability as a resident... no worries.
You obviously don't want to ever falsify medical records, and I agree that "sometimes you learn what NOT to do" during residency. Still, any malpractice or insurance audit or etc etc would go on the attending who is supervising the case/clinic or the facility that employs you. Residents are pretty much immune unless it's gross misconduct on their part, which would just get them probation, suspension, fired, etc. As mentioned, you could potentially get deposed or interviewed or whatever regarding malpractice or an audit related to your residency, but even that's pretty unlikely since any suit or audit would probably be years after you graduate training. You just keep quiet and play the 'I was under supervision and doing as I was told' card.
Don't sweat any dumb stuff attendings do would ever pin to you. You aren't the one boarding the cases or submitting the billing. Associate is a whole other story, though... fraud billing, fraud DME, balance billing, upcoding, etc by the ownership can be very risky to the associate.