I would also, given your examples, ask whether the error you spot might simply be a lack of time for the task, not a systematic weakness?
If there’s a spelling error in a spelling list, consider whether it’s in line with everything else you see - does the teacher routinely mis-spell in these lists; in class communication; in their reports; in their comments in your child’s book; in their displays; in their worksheets? If so, yes, definitely worth politely raising either with the teacher themselves or as a potential CPD need with the next level up. If it’s a one-off, might it be a mis-type late at night or early in the morning of an overwhelmingly busy day?
Similarly marking an answer wrong. Did the teacher mark it, or is it a peer marking / YA marking / self marking? Is it a clerical error, or a genuine misunderstanding (eg 241 x 0 = 0 marked incorrect likely to be a misunderstanding, one question out of 25 in a times table test accidentally marked incorrect, probably clerical). How many questions were set, what was the turnaround time for you to get the work back, does it happen every week?