One of Kennedy's advisers uses the term "as pure as Mother Teresa." Although the BBC aired a documentary in the UK on Mother Teresa in 1969, it was not until 1971 that the US knew of her work through the book, " Something Beautiful for God."
The exterior door used in the movie as the home of the Kopechnes is a fiberglass model with an oval glass insert with brass caming. This style of door didn't exist until the mid 1980s.
When starting his TV address, Ted's tie knot is skewed to Ted's left and it then centers itself in later shots.
The movie depicts the moon being full on the night of Kennedy's crash; in reality, the moon was full July 29, which meant that it would have been a waxing crescent on the night July 18.
The car Ted Kennedy was driving at Chappaquiddick was a 4 door sedan with center pillars behind the front doors. The car in the movie is a 4 door pillarless hardtop. .
Ted asks the operator to make a collect call and gives his name, but never gives a phone number. The operator patches the call without it somehow.
When flying the kite at the beach, the kite is shown flying out over the water, but the wind is blowing onto the shore as evidenced by the way the grass is bending.