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.
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.
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)
Near the beginning of the film we see Starsky and Hutch about to get into their car in a very busy street, they themselves are virtually surrounded by onlookers, but as they get into the car and drive off the street is deserted.
(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.
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.