In the meeting with Senator Ross, the movie indicates that it is 1973. Senator Ross makes a reference to Gerald Ford being in the White House. Gerald Ford did not become President of the United States until 1974.
In the montage before Bundy is arrested for the first time, when he stops to urinate, the beer bottle on the ground by his car is a modern Bud Light bottle.
Bundy is shown as attending the University of Washington, which is in Seattle. Outdoor scenes during this period in the film show numerous palm trees, which of course belies the filming location as much further south.