When Hyde presents a military ID to the waitress to purchase alcohol, it has a color photo. While the format is period correct, military IDs didn't begin to have color photos until the early 2000s. In addition, it is inconceivable Hyde's hairstyle and sideburns would be believable for a male military member.
When Grandma Forman dies while Eric is driving her home, Grandma falls against Eric's shoulder and is clearly still blinking when she is supposed to be dead.