The phone number hikers use to call for help (555-2368) has also been used in Night Call (1964), The Rockford Files (1974), Ghostbusters (1984), Far and Away (1992), When a Stranger Calls (1979), Forever Young (1992), and Howard the Duck (1986).
Tommy's (Jacob A. Ware) last name MacKaye, seen on his name badge, is a reference to Benton MacKaye, an American forester, planner and conservationist, known as the originator of The Appalachian Trail (AT).
The phone number seen on the sign, 555-2368, is connected to several other titles including Night Call (1964). Elva Keene (Gladys Cooper), receives anonymous phone calls in the middle of a stormy night, similar to Carly Kansas (Melanie McNulty).
Keen Footwear also makes an appearance in the film.
If you look closely, a Missing Persons flier can be partially seen near the telephone. Carly explains that her Dad is gone, presumed missing. In The Rockford Files (1974), Jim Rockford (James Garner) often investigates missing persons cases.
The truck license plate, 01S 923, references when the Appalachian Trail first opened. On October 7, 1923, the first section of the trail, from Bear Mountain west through Harriman State Park to Arden, New York, was opened. October 7th is also co-director Hyten Davidson's birthday.