The starting point of this story - a man knocked unconscious dreams he's returned to King Arthur's time - takes as its starting point Mark Twain's "A Connecticut Yankee in King Arthur's Court". MacGyver's story takes a different path from Twain's, without the latter's corrosive misanthropy.
The trivia item below may give away important plot points.
MacGyver's given name is finally revealed here. The name Angus was chosen because they felt it was unusual and something with an "ick" factor (although not according to any Scots in the audience). The name was "suggested" from a poster for a charity event in Canada, where the series was being filmed at that time.