In 1990, Logan and Hemmings find a ball and glove with the 1996 New York Yankees team signatures. This was not possible as that exact team did not exist in 1990.
Logan and Maddox are in 1990. Maddox talks about betting on the 1996 World Series, which would not be possible in 1990 since the game was 6 years in the future.
Easter wears a wedding ring yet a previous story states he is single.