After Henry Quayle overturned the vending machine there were no candy bars on the floor next to the machine. He then bends down and picks one up off of the floor where there are now multiple candy bars.
In the close-up shot of Chet throwing Rose to the ground, the knife is laying flat on the ground. It then cuts to a wide shot and the knife is now sticking out of the ground.
In the first scene, Kelly is reading a newspaper with the headline "Solar Eclipse This Week." However, the next scene has Kelly and Henry meeting outside a food truck two weeks later. The solar eclipse occurs the next day.
In "Skincrawlers," Kelly's prosthetics are clearly obvious.
In "Skincrawlers," while the leech may suck the fat out of a person, it doesn't account for their skin tightening up to match their new, slimmer physiques. They should have ripples of loose, flabby skin hanging all over their bodies.