When she holds up the phone in the cabin, we see Helen's last name is Phillips, and her phone number is an actual one (not the usual 555 prefix), 424-284-9328. Area code 424 is from the Los Angeles area.
Linda Hamilton portrayed Sarah Connor in The Terminator (1984) franchise, a series that also heavily involves time travel.
Helen's stunt double smashed the car windshield in one take.