Telephone numbers without area codes
Alphabetic telephone exchanges - ie the first 2 places after the area code, like TI for Tiffany - was 84x. I saw an old photo advertising a local venue with this strange old phone number!
Postal codes (single or double digits) between the city and state instead of zipcodes
"Real" (not postal) state abbreviations: Mich., Fla., etc. - you could actually figure them out!