Unrated version includes more swearing from the Dukes, dialogue extensions (like Cooter asking for a BJ from Daisy for the fixing of the General) and some scenes where the sorority girls are topless.
For the UK release cuts of 12s containing 'glamorisation of drug use ' were ordered by the BBFC in order to achieve a 12A certificate as requested by Warner Bros. and not an uncut 15.