The incorrect information is:
The roller coaster would only have kinetic energy at the point labeled “gravitational potential energy and kinetic energy.”
This statement is wrong because at the point where both gravitational potential energy and kinetic energy are labeled, the roller coaster has both types of energy. At this position, the roller coaster would not exclusively have kinetic energy; rather, it would have a combination of gravitational potential energy (due to its height) and kinetic energy (due to its speed).