Kate Gunzinger's proof of the "Snake Lemma" at the very beginning of the movie is technically perfect. Charles A. Weibel's book "An Introduction to Homological Algebra" (1994, Cambridge University Press) includes the following statement "We will not print the proof (of the Snake Lemma) in these notes, because it is best done visually."
Debut theatrical feature film of actress Dianne Wiest who was billed as "Diane Wiest" and portrayed the character of Gail.
The old-timers baseball game that Michael Douglas's character plays in at Yankee Stadium was filmed on June 21, 1980. It was filmed on location during the actual Yankees old timers game. Members of the teams were Joe DiMaggio, Mickey Mantle, Yogi Berra, Larry Doby and Bob Feller.
The producers cut an erotic dance sequence from thr movie. This inspired screenwriter Eleanor Bergstein to write the film script for Dirty Dancing (1987).
To prepare for her leading role as mathematician Kate Gunzinger, actress Jill Clayburgh researched math by a spending a whole day's research with the Mathematics Department of Princeton University, where Clayburgh was tutored by a maths professor.