The end of this episode closes with The Boomtown Rats' song, "I Don't Like Mondays" which was written by Bob Geldof after the 1979 mass shooting of 16-year-old Brenda Ann Spencer at Grover Cleveland Elementary in San Diego, CA. The song's title is attributed to Spencer's quoted reason for the shooting: "I don't like Mondays."
The knot the man is tying over and over before the opening credits is a bowline, a common maritime knot.
At the closing credits "I don't like Mondays" by The Boomtown Rats is played. This song came out in 1979. A few years after the timeline.