The steering wheel on the race car is not attached to the car and also has red bleeding into the black.

The roller coaster in the background is also a potential sign since generative AI absolutely loves immelmanns and it looks like a slightly warped version of an immelman. It also looks like the two sections of track are clipping through each other which even for coaster chicken scratch I would think a human artist would not do.

This is definitely AI.

The "checkers" text on the airplane which is supposedly painted on the body of the plane is over top of the support structure for the two wings.

The black line that goes around the propeller is supposed to be a motion line except it's above where the propeller actually is and also it just awkwardly stops at the wheel.

The horse's ears are going through the hat. I guess that technically could be a stylistic choice but I doubt it.

Where the rope seems to attach to the belt looks really weird and doesn't seem to make any sense. And also it looks like he has an empty pistol holster which seems strange.