After The In-Laws (2003) came out, Alan Arkin called Peter Falk to congratulate him on all the great reviews he was getting from critics recalling the original as they trashed the remake.
In the 2003 DVD commentary, Alan Arkin relates that Marlon Brando once told him he had seen this film 20 times and even imitated Arkin's delivery of certain lines from the film. Writer Andrew Bergman contends that Brando's appreciation of his script was integral to getting Brando to star in The Freshman (1990).
When Vince is getting directions to meet the general, the streets include "United Fruit Boulevard," a reference to the US company that historically dominated much of Central America--economically and politically--and gave rise to the expression "a banana republic."