One example, the other is the the HEAVY resemblance of the french teachers art to an artists called Incase as another example. At first i thought it was just that, a close resemblance. But if you notice how much the scene in the stores dressing room (bj scene) looks pretty far off from the actual character. My guess is that they found another head after typing in "Milf" somewhere and tried to balance the difference.
ALSO, the inconsistencies with the "mother" characters art. Not trying to play detective, but with such extreme diffrences in "style", shit is easy to spot. The hard part is finding what it might have come from.
Its not a complete 1-1 trace, and inspiration has to come from somewhere BUTTTTTTT, this shit needs to get "fixed". If he reaches his goal, that should be plan A.