At the restaurant when Grant first sees Adam Barlow, Adam says 'this is your chance to fix things that we failed to do 40 years ago'. Every other time the time from the past is mentioned it is 60 to 63 years ago.
When Tess shows up and talks to Allison, the viewer doesn't know it yet but she is just a hallucination, but, when she leaves, the door opens for her as she walks to it like she is really there. A hallucination would not trip the door opener. They should have had someone entering just as she was leaving to keep the illusion that she is real.
Deputy Andy says Carter can't hear a sound because the human hearing range decreases with age. That is correct, humans lose the ability to hear high frequencies as they age. The problem is That he says the sound is 70 Hz which is a very low frequency near the lowest frequency of 20 Hz that humans hear and that does not decrease with age, only high frequencies.
Trevor Grant is inputting a numerical code on a computer keyboard. Numeric keys are located along the top row, but Trevor is pressing keys in the alphabetic region of the keyboard.
After Carter's Jeep is destroyed, it can be seen in the next scene at his house completely intact.