I'd be more worried about whether they put the drain plug back on correctly or if they put in the correct type and amount of oil. No kidding. I've had several cases where my Wife got an oil change and oil was dripping from the oil pan because they didn't install the drain plug correctly. Fortunately, no one as stripped the threads (that I'm aware of).I'll pay someone to change the oil and filter on our car, but won't spend on tools unless there is no choice. In the case of an oil change, occasionally I'll look in there right after to see if they actually put a new filter on, but not always.
A couple times too much oil was added. They didn't think it was a problem, but I made them remove the extra (they probably spit in it while they were doing it). Most times the oil is half a quart low.