Accusations of plagiarism and priority discussions
Some of Einstein's critics, like Lenard, Gehrcke and Reuterdahl, accused him of plagiarism, and questioned his priority claims to the authorship
https://en.wikipedia.org/wiki/Criticism_of_the_theory_of_relativity
The question of whether Einstein's wife Mileva Marić contributed to Einstein's work has also been raised
The object that is moving in the reference frame will be shrunk in the direction it is moving
If the race track is moving underneath a racer the race track will be shorter & so it will take less time to run the race
If the race track is stationary and the racer is moving then the track will get longer & it will take more time to run the race
If there is say a spiked wall a certain distance after the finish line then the racer might die in one reference frame and live in another