Audio problem: About 10 minutes into the movie, Howard and Eunice are standing at the head of the hotel's escalator listening to Judy define the word "propriety" as she descends; instead of diminishing in volume as it ought to, the volume in this speech stays the same and even increases a little right at the end.
What's Up, Doc? (1972)
1 audio problem - chronological order
Directed by: Peter Bogdanovich
Starring: Barbra Streisand, Ryan O'Neal, Madeline Kahn, Kenneth Mars
Revealing mistake: In the early part of the chase scene, when the person hanging the banner swings into the pane of glass, you can actually see it start to shatter before he touches it.
Hugh: I find that as difficult to swallow as this potage au gelee.
Judy: How would you like to swallow one sandwich d'knuckles?
Trivia: Much of Hugh Simon's dialogue was ad-libbed by Kenneth Mars.