When Starsky jumps into the swimming pool after the hitman, he is wearing his trademark white cardigan. As he climbs out, however, he is wearing a blue shirt. A moment later, he is wearing the cardigan.
(at around 1h 04 mins) Zane or Cannel put two shotgun blasts through the door, with Starsky just to the left of it in the hall. When the bad guys open the door from the inside the two holes made by the blast are gone.
The license plate number on the Torino that Starsky drives to the gym is the same as the Torino with the bullet holes in the window that is seen in the police garage, but it is supposed to be a different car. (848 ASB)
When Starsky comes out of the pool, his famous Mexican sweater has a very wide strip in the middle with a pattern of hearts. However when he first went in the pool and when he gets his sweater dried in the next scene, it's his original sweater he was wearing throughout the pilot which has a much narrower strip with a pattern of right side up and upside down triangles.
When Starsky jumps into the swimming pool after the hitman, his gun is in his right hand when we see him in his blue shirt. When we see him a second later with the sweater back on, his gun is now in his left hand.
At one point an assassin is shown reading Will Durant's "Age of Voltaire." He quotes from the book: Thy hand, great Anarch, lets the curtain fall, and universal darkness buries all," telling another character "Voltaire, 1744." In fact, this quote is from Alexander Pope's great work of satire "The Dunciad."
About 8:30 min in, after Starsky & Hutch bust the pickpocket, there are many background people laughing and grinning, as they stare straight into the camera, while they watch the filming. It is evident that those weren't paid extras.
In the pilot, the two hit men (Zane and Cannell) are allegedly watching the famous John Wayne western "Red River" on TV. However, the footage they are watching of a cattle drive is in color, whilst "Red River" was a black and white film.
On the Captain's door, his name is spelled "DOBY" instead of "Dobey".
In the Frankie's gym, Starsky is waiting Hutch and the owner, Frankie, is collecting the used towels and in the background, Hutch is finishing his shower and can be seen completely nude.
At the end in the alley, it's visible in Hutch's car rear window reflection as he drives away.