Yeah, my classmates have found lots of errors in grading and in things like keying the exam in other courses in the past. With this last exam, there were errors with how IT put the questions into the system (like if a question was supposed to have 5 answers to choose from, and there are only 4), and they forgot to add one set of questions to the exam altogether, so even if the faculty do everything perfectly, it could still get messed up.
Disappointed but not surprised to hear that not letting students review exams is common in other schools. It really is an important learning tool. When I don't get to see my exam after, then the meaning of the entire exam becomes just about the grade since I literally can't get anything out of it after taking it except that number. Some of the stuff I remember best is from questions I got wrong on exams that I got to look at and think about after the fact to figure out where I made mistakes. Maybe I'm just frazzled and drained and burned out and generally grumpy, but it really bothers me that we're having that learning opportunity taken away from us in some courses.