The Star Trek (1966) episode shown briefly on the screen is "The Enemy Within" an episode about Captain Kirk being split into a good and an evil part by the transporter.
Action editor Billy Weber was brought in by Paramount to deliver a new cut of the film after the initial cut was rejected. He receives a "Special Thanks" credit in the closing scrawl.
After Sid's hand is blown off by a security guard's shotgun in scene at the fight arena: He jumps the fence to escape the ring after he spots Barnes, and you can clearly see the fact that a 'hand' is still present by the way the actor (or stunt double) uses that hand to help hop the fence.
In the shootout, as they run to the roof, Sid pins Parker down behind a girder with gunfire. As he fires, ricochets bounce off the railing around him even though Parker has yet to shoot at him.
Hologram Head: While officers gather evidence of the grisly crime scene, you can only ask yourselves, "What kind of lunatic would commit such unthinkable crimes?" The three adjectives which best describe this killer are sadistic, intelligent and dangerous.