When 2 independent clauses are inappropriately joined by comma.
These 2 clauses are independent clauses but related to one another.
I love "Li'l Tony 2: Pony Up 2 the Street", it's my favorite movie in the Li'l Tony franchise.
It can be corrected into 2 sentences using a period or semicolon:
I love "Li'l Tony 2: Pony Up 2 the Street". It's my favorite movie in the Li'l Tony franchise.
I love "Li'l Tony 2: Pony Up 2 the Street"; it's my favorite movie in the Li'l Tony franchise.
These 2 clauses are independent clauses but unrelated to one another.
Cabbage is my favorite vegetables, Unlike carrot, I dislike its stinky smell.
It can be corrected by splitting into 2 sentences instead:
Cabbage is my favorite vegetables. Unlike carrot, I dislike its stinky smell.