Driving with parking brake engaged

My wife drove my 1971 Duster home tonight on the freeway (about 25 miles). When we stopped at the exit I noticed a smell and asked her if she disengaged the parking brake. She hadn’t. Now I’m wondering how much damage may have been done and what I should look for to identify the damage. Should I take it in for an inspection, or just keep driving and watch (and listen) for something unusual?
It's about the same as when I'm in the water box at the strip... lol