A few outdoor city street shots that are supposed to be in the middle of the night are taken during the daytime.
When the salesman is shown a photo of the dead girl to identify, she is lying face up, but when Kojak takes it back, he's seen holding the picture, which now shows a girl face down on a gurney.
The stolen printing plates are seen three times, each showing a positive image, identical to a Canadian $20 banknote, back and front, which if used, would produce a negative, backwards image.
When the girl escapes with one of the printing plates, it's of the back of the banknote, but at the end, when it's recovered, it's the face side.
When the salesman returns to his hotel, he takes a copy of the tabloid New York Daily News with him up the elevator. When he's next seen on his floor, the paper has become the rival New York Post.
Maurice Cherneff is shown drinking from a can of Coors beer. At that time Coors was only available out West and wasn't available anywhere east of the Mississippi River, so it wouldn't have been available in New York city, but it would have been in California.
The stolen $20.00 plates were positive images, not reverse. This means that if the plates were actually used to print, the resulting bills would appear to be backwards, thus making them useless.
"Manhatten" is misspelled on Margaret 'Peggy' Farrell's driver's license.
When Kojak is reading the rental car agreement found inside the Chevy Nova that Peggy had stolen from Tatum, it states the type of car rented is a Toyota Celica not a Chevy Nova. Coincidentally, the Toyota Celica was Peggy's own car that she had been driving earlier that ran out of gas in front of the hotel where she met Tatum.
Margaret P Farrell's drivers license has a date of birth of 25th September 1966 (shown as 09/25/1966) which would mean she was only 8 yrs old considering the episode is set when it was first shown in 1974.
Kojak is seen racing through the streets of Manhattan en route to the Hotel Royal. His Buick Century is seen turning the corner and coming to a stop in front of the hotel. The exact same scene is repeated in a later return trip to the hotel.