In "Brainy Smurf, Friend to All the Animals," Brainy is shown talking to a skunk. However, skunks are found only in the Americas, not Europe (which is the setting of the cartoon series), so that skunk should have not appeared in the first place.
In "Brainy Smurf, Friend to All the Animals," Azrael saw and fell in love with a female bobcat. However, bobcats are native to North America, not Europe (which is the setting of the cartoon series), so that bobcat should have not appeared in the first place.