Here's a funny story about final check and a mistake in clean up,that went thru color final check and onto FILM before people noticed it.

There was a cycle scene of a man in an innertube in THE CHIPMUNK ADVENTURE,, the man was floating in a pool ( I animated the water in the pool, that worked fine) The animated man was in swimming trunks, and shirtless,,, His body and the inner tube were on a cycle that looped many times as he sat in the pool, in the innertube.

On film, in color... in the man's chest,,, one of his nipples popped off in the looping cycle. It was not drawn nor was it painted on some of the looping frames.

It drew attention to his nipple like a blinking light.
It was hilarious to watch the popping nipple,,, but disastrous to the schedule and budget,,, because the entire scene needed to be RESHOT ( it was on FILM,,, not a digital fix back then)

Always always give your self time for a final roll thru of your scenes,,, and put on the mind and the eye for anything that needs corrections before you call a scene FINAL.

If checkers keep coming back to the same person for fixes,,,, it does get noticed by production managers.. and it will hurt you in the long run,

SO work ROUGH at the start when posing your animation, to capture energy and emotion and action.

BE very careful at the end of production to catch all the " fiddle-dee bits" that need your scrutiny and attention.