It's not so much the fact that Administration makes errors, it's the fact that thy're such stupid errors, and that they're so hard to fix, and at times it's also their shitty attitude.
A friend of mine was waiting for his paperwork indicating his acceptance into honours. We had all received ours, so he went to see the faculty office. The person there taps away at the computer, and then says to him "I'm sorry, we have no record of your existence". Not no record of his enrollment for honours, no record of his existence. No record of his grades for the three years of undergrad he had completed, no record of the pass degree that he was eligible for if he didn't do honours, nothing.
He was, understandable, shocked (and worried) by this statement. This was met with an attitude of 'the computer is right, and anyway what do you expect me to do about it'.
Well, he went to see the Student Centre - who have the computers that hold student records. Fortunately, they had record of his existence (lucky, as he was trying to figure out if he still had all of his exam result notices to prove his existence - another reason for my advice above to keep every piece of paper.) When he went back to the Faculty Office, they blamed the error on the fact that "the cable linking our system to student records does not like to transmit certain data". No possibility that an error had been made by administration - no, it was all the fault of the cable! Is it any wonder when they cause a stupid problem like this, causing a student some serious anxiety in the meantime, that people get pissed of at them?