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1.
Which one is wrong?
Card suits; hearts, clubs, diamonds, and bananas.
2.
Which one is wrong?
Four seasons; Spring, Fall, Winter, and, my favourite season, Frog.
3.
Which one is wrong?
The four elements; Earth, Water, Fire, and Hair.
4.
Which one is wrong?
The four Corner States.
5.
Which one is wrong?
The Teenage Mutant Ninja Turtles; Raphael, Leonardo, Michelangelo, and Botticelli?
6.
Which one is wrong?
The four nations of the United Kingdom; England, Scotland, Wales, and Greenland?
Also for the fifth question you need crop it a little more at the bottom.