A man at the country club jokes "what's next, banning DDT?" and everyone laughs as if the idea is absurd. Efforts to reduce DDT use had been going on since the 1950s and became widespread with Rachel Carson's book Silent Spring in 1962. While DDT would not be officially banned in the US until 1972, a year after the scene takes place, the EPA had begun the process needed to ban DDT in early 1971. Even if someone disagreed with the decision to ban DDT, that possibility would not be viewed as absurd in 1971, but likely.
Bambi performs the Heimlich maneuver a year before Dr. Heimlich developed it.