The MAD Magazine Catcher Block reads with a parody of 1960s feminist Barbara Novak on the front was created specifically for the movie. A special 1960's-style cover was drawn by one of the MAD artists. See more...
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Continuity: At the start of the movie, when Barbara crosses the road from Grand Central Station to catch the taxi, there is a blue car parked in front of it. Then when the shot is shown from the rear of the taxi, the blue car is gone. When the shot moves back to the side view, the blue car is back there again. In addition when the shot is taken from the side of the taxi, there is no green fence visible, however, when the shot is from the rear of the taxi, there is a shoulder-high green tubular fence on the footpath.
Revealing: Toward the end of the film when Catch has been left on his own by Barbara, and it begins raining heavily, he doesn't look like he is getting very wet. As the shot pans out, you can see on the street, that the rain is falling everywhere except for a perfect square around Catch, due to an off-shot prop.
Factual error: At the end of the movie mention is made that Catcher gave Barbara his publisher's Celestron telescope, shown earlier in a scene where the two are looking at the moon. This was probably product placement, but the C10 design shown in the movie was not offered by Celestron until 1964 (the film is set in 1962) and it sold for a price of around $2000, not $6000 as stated in the movie.