Sounds like the best of all possible worlds! I'd still suggest, as a takeaway lesson, that you examine every character sheet before it enters play. Heck, I introduced my brother to D&D some 30 years ago, and I've stood up to
Hypersmurf in some meta-rules debates

, and my brother STILL checks my sheet every time I level up, for several reasons:
1) He's not worried about me cheating, that's not one of the reasons.
2) He wants to make sure I did all the calculations correctly. Once in awhile he'll find that I forgot to add a bonus, once in awhile he'll find that I gave myself an extra point somewhere (my touch AC might include my shield, for example), and once in awhile he won't understand why a score is a particular way, and I'll explain it to him.
3) He wants to make sure he understands all the tricks I have. If he's confused about what "Color Spray" does, he doesn't want to have to look it up mid-battle, he wants to be ready for it. Generally he relies on me to know my stuff, but maybe he's planning on springing a giant spider on us, and he wants to know in advance whether Color Spray would work against it (it wouldn't, of course).
It's definitely worth checking sheets before they enter play.