Father Ignatius runs back into the theater, closing the door behind him. When Starsky runs in after him, the door is now wide open.
During the car chase after the initial robbery there are various shots of Starsky & Hutch in the Gran Torino, close up and wide. In the wide shots the beacon can be seen on the roof of the Gran Torino above Hutch's head but in the close-up shots, despite being able to see the roof where the beacon would have been, the beacon is absent.
In the theater gunfight, the man dressed as a priest fires his 6-shot revolver 7 times.
When the robber uses explosives to open the safe at the jewelry, you can see the safe door is made of plywood when it blows.