In the cemetery there is a headstone that says Vaughn. An Easter egg for the writer of the comic, Brian K Vaughn
Is based on the comic book series Paper Girls, published by Image Comics.
Mac's whole image and attitude is a direct copy of John Connor in Terminator 2, another time travel story.
In the premier, Mac says she was a Care Bear for Halloween when she was 4 years old. Care Bears (the toy) weren't introduced until 1983. As a 12 year old in 1988, Max would have been 7 when Care Bears first came out.