On screen the title was Dragnet 1970. The show opens as Sgt. Friday says it was Thursday July 10th. July 10th that year came on a Friday.
In Mrs. Periwinkle's apartment, the studio lights are constantly reflected in her eyeglasses.
Mrs. Periwinkle demands that Gannon show her his I.D. through the peephole, to prove he's a cop before opening her door, but he proceeds to show his ID to the camera (meaning towards himself) so that the lady couldn't have seen nor read his I.D.