(1971, Walter Matthau, Deborah Winters)

Jack Lemmon's only film as director. Daniel Dey notes “Then middle-aged Walter Matthau played a senior citizen who takes care of a teenage babysitter who was impregnated by her boyfriend.”
This anonymous GM 'New Look' appears:

We see an MCI MC-5, and Kotch (Matthau) rides an MCI MC-6:

There's also this tiny Taylor-Dunn: