Effect on other players.
Here is a recent situation. 3 players at a $1 minimum player. I had 2 hands of $10, Player B has 1 hand of $1, and Player C has two hands of $25. Player B and I both are dealt stiffs and stand. Player C splits and doubles like crazy on both hands until he has $150 on the table (and has to go into his pocket). Dealer turns over a low card to go with her low up card, then hits to a 6 card 21. Dealer thinks she has 16 with 5 cards (really has 15). When she flips the final 6, she announces "One too many" and starts paying all the hands. Player B ($1 better) speaks up and says "Wait, you have a 21". This really happened.
Given the significantly different amounts of money at stake, I believe that it was up to Player C to decide whether he should call out the error, and that Player B was effectively butting in where he did not belong.
I couldn't resist splitting tens the next time Plaer B had his "big" bet out ($5). When he complained, I told him that he could complain after I did it 60 more times and cost him the same $300 that he had cost Player C. For some reason, he left after that hand.