When Ronnie shoots Roxanne, blood gushes all over the gun. In the very next scene, when he lays the gun down next to the phone, it is spotlessly clean.
During the first party scene, Emerson drops a tray carrying multiple bottles of scotch. In the next shot, the floor is covered with broken glass, but no spilled liquid.
When the Carrie Nations are celebrating with Ronnie and his social circle backstage, Roxanne moves away from Ashley to talk to Casey in the background as Ronnie boasts to Susan and Porter. In the next shot, Roxanne is back by Ashley's side as she excuses herself to go talk to Casey.
Ronnie picks up an extension phone when Casey is in the middle of dialing her friends for help. The phones used are 500 series Western Electric business phones. Because of the way rotary dial phones work, picking up an extension would prevent any phone on the same circuit from being able to dial.
When Harris and Kelly play chess, Harris claims he lost when his bishop could have captured Kelly's knight. This could be intentional.
When Ronnie drops Lance Rocke's severed head, it breaks in half when it hits the floor.
When Ashley is driving Harris home, many of the shots show the night outside. When the Rolls Royce approaches his house, it's clearly day, badly disguised as night.
During the Carrie Nations' performances, horns can be heard in the music. There is no horn section in the band.