In the final scene Harmony's hair changes between shots. This is because the final dialog was written in after the episode has finished filming, and pick-up shots were required.
When Harmony puts the body in the dumpster it's visible around shoulder height but in the next shot it's vanished.
The "To Do" list which Harmony writes for the demon summit changes. In the first shot, it is headed in bubble letters; in the ensuing close-up, it is not and has fewer items.
Fred says the bite marks are 17 millimeters apart, or 0.67 inch, which is much too small for an adult jaw.
In a close up, the corpse Fred examines to determine who killed him, takes a breath and his eyes move behind his closed eyelids.