(at around 28 mins) The black floor lamp in the smokers apartment changes position between shots based on perspective.
(at around 55 mins) While in Young Soon's apartment, the amount of milk on Cleveland's beard clearly changes between shots.
(at around 1h 23 mins) The Scrunt drags Story though the mud and grass grass during the attack. Story just has scratches on her legs even though she was dragged by her arm. Her arm appears to be uninjured. Her shirt shows no signs of mud, blood, or grass stains after the attack.
(at around 28 mins) When Cleveland unblocks the drain in the hippie apartment he wears green rubber gloves. Next shot (same scene) he holds pliers and doesn't wear the gloves.
Before Cleveland Heep dives into the pool after Story, he takes his glasses off. After Story saves him, his glasses appear and disappear during shots, especially during the sequence where he is talking to the tenants.
(at around 32 mins) When he sees Vick's book "The Cookbook," Cleveland Heep says to himself, "This is s-s-s-s-silly." Stutterers often do not have a stammer when talking to themselves; they stutter primarily when talking to other people. However, Cleveland's stutter is a symptom of Post-traumatic Stress, in which case the stutter typically remains constant regardless of social situation until the stress is dealt with.
The first time Cleveland and Story encounters the scrunt, Story sees it and screams and Cleveland runs headlong into his house. during this entire time Story is pointing behind, supposedly at the scrunt; , nowhere near where she is pointing but it is almost at right angles beside them.
After Story saves Cleveland from drowning, the bed he wakes up on is nowhere wet enough to have had a soaked person on it.
(at around 5 mins) Reggie's muscular arm is an obvious prosthetic; it doesn't bulge as he lifts weights.
During a couple scenes, a hefty wind sound effect plays as the pool and the surrounding trees and bushes are shown. Neither the bushes nor the trees are blown by the wind.
(at around 1h 17 mins) When Mr. Farber introduces himself as "13B" at the party, one of the two people listening says "Good for you" without moving their lips.
The Tartutic creatures punish the scrunts if they are to break the rules of the blue world. These rules are never established or laid out so we don't know what rules the scrunt is breaking, and if these creatures are so evil then why would they care about who's being fair?
Once the apartment tenants are told about a magical water fairy and mythical creatures surrounding the complex none of them seem to question these claims or dispute them.
(at around 57 mins) Story says that she is forbidden to talk about her blue world to humans and therefore communicates with sign language when talking about her world yet she tells Cleveland everything he needs to know about how to spot a scrunt in grass through a walkie-talkie.
(at around 1h 4 mins) Given the length of the words mentioned, 9-across cannot touch 27-down in a crossword puzzle, as Mr. Dury says interpreting the puzzle while Story is in the shower (it would have to be at least 19 letters long to do so).