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Continuity mistake: Dan set his lighter on top of the pack of cigarettes with their bottoms flush, but a close-up showed the lighter at an angle with one corner protruding past the bottom of the pack of cigarettes. (00:04:52 - 00:05:28)

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Trivia: Director James C. Clayton co-wrote the screenplay and played the role of "The Thief" (who was not given a distinct name).

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Trivia: The name of the L.A. University where Jim is a professor is not pointed out, but it must be fictional. The West L.A. College (WLAC) has a basketball team nicknamed the "Wildcats" and Lamar's basketball uniform (white with red lettering and trim) looks strikingly similar to those worn by WLAC Wildcats, but WLAC is a community (two-year) college where Lamar could not be a "junior."

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Continuity mistake: The cut (s) on Jim's lower left lip frequently changed. At the "Wildcats" game, there appeared to be three slits, but they were not easily seen and it wasn't apparent how he got them. In the earlier beating he got from Lee's Heavy #1 and 2, his lip didn't get cut and the previous cut on his lip was not visible. When Jim met with Neville, he had three distinct vertical slits/cuts on his lower left lip. Thereafter, the appearance (presence or absence) of these cuts continued to vary. (01:25:55 - 01:31:45)

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Continuity mistake: The broom (?) handle that was sticking out of the pile of plastic was leaning into the corner of the empty swimming pool. At a more distant view (opposite end of the pool), it should have been visible but was not. In later views, the handle's position varied - straight up (not diagonal) and leaning in a different direction. (01:09:19 - 01:11:44)

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Revealing mistake: Neville pushed Jim's back against a metal garage door/gate in the alley. Front views of Jim show him with his back (and head) against the door, but rear views show him out in the open (away from the door/walls/buildings). (01:01:42)

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Trivia: "Neville B 187" is spray painted on the wall in the alley where Neville confronts Jim. "One-eight-seven" is slang for murder. In California, murder falls under Section 187 of the crimes code. (01:02:13)

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Easter egg: The view of the numerous wind turbines tend to catch the viewer's focus, but - in the lower lefthand corner - it looks like an off-white T-Rex is about to go into the town. [00:59:07].

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Revealing mistake: The (CGI) wind turbines were awkwardly spaced and incomplete in spots. Ten or more sets of blades (center left of screen) had no towers attached to them - just blades "in the air." The blade lengths varied from tower to tower instead of being uniform and appeared to be disproportionately small relative to the tower heights. Nocelles were absent (or not visible like they should be), so there were no anemometers attached. Most towers did not appear to have a transformer at/near their base. (00:59:07)

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Deliberate mistake: Jim was sitting on a bench along the road and Amy [Brie Larson] walked by (several feet away), apparently not noticing him. (Jim was seated between other people.) Brie got into her car and adjusted the rearview mirror, catching sight of Jim on the bench. A driver would adjust the rearview mirror, if necessary in the first place, to align it with the rear window, not angle it to the right to be able to see the sidewalk. (00:51:34 - 00:51:55)

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Revealing mistake: When Amy was walking past the bicycle rack along the road, the background changed a few times (indicative of using a green screen) and she walked past the same bicycle rack at least two times. Sometimes, there was no bicycle rack visible, although Amy had not walked very far. (00:51:00)

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Plot hole: Lamar was a star basketball player who didn't pay attention in Jim's English Literature class (and wasn't "good in English") but needed to pass to continue playing. Lamar told Jim, "I've had four courses with you" and "I'm a Junior." Whether this was Lamar's 4th or 5th English course, neither make sense. A fourth course would equal 12 credits - enough to be Lamar's' declared major (unlikely) - and most students don't enroll in the same professor's courses when they don't do well ("easy A"). (00:43:56 - 00:46:40)

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Continuity mistake: Amy set Jim's book perpendicular and very close to the desk's front edge and the pen was diagonal on the book's cover but not close to the desk's edge. When the book came back into view, the pen had been straightened and moved closer to the desk's front edge. (00:36:30)

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Continuity mistake: A side view of the tennis court observation tower shows the umbrella angled around 45°, arched over Jim's head. A front view shows the umbrella behind Jim's back, more perpendicular to the ground. In the next rear view, his body is tilted toward the right, the umbrella is arched half-way over his head again, and his legs are no longer crossed. The next front view shows the umbrella in back of him again (more parallel to his upper body) and is fanned out backwards to not obstruct his face. (00:26:42)

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Revealing mistake: Jim parts his hair on the left side. The stacks of his books on display in the hallway include a photo of him with his hair parted on the right side, but otherwise looking the same. Hair that is persistently parted on one side will not easily part on the other side and lay across the head in the same way. (The image was reversed). (00:25:20)

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Continuity mistake: Numerous times throughout the movie, the blood splatter on Sam's face (especially noticeable on the right side and above her right eyebrow) varied. For example, sometimes the blood above her eyebrow was straighter compared to usually arched and the length, width and/or vividness of the red "blood" changed (perhaps due to filming on different days and/or re-applying/ refreshing the make-up). (00:49:07 - 01:33:36)

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Stupidity: Sam slid under the truck to narrowly escape the lioness. Even though there was more than enough ground clearance, the lioness did not go under the truck to attack Sam, as though the truck's frame were a barrier. The lioness could have easily crawled under the truck (unless a CGI lioness is not as spry or nimble as a "real" lioness). Sam being under the truck would not constitute adequate protection from an attacking lioness. (01:10:30 - 01:35:20)

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Continuity mistake: The amount/shape/size of the blood/cut on the bridge of Joey's nose varies, as does the obvious presence or absence of blood on the right side of his nose. (00:42:32 - 00:43:50)

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Continuity mistake: The blood that was on Leonard's right cuff disappeared and re-appeared a couple times. When he was cutting the bloody suit, the blood on his cuff was gone. When Leonard looked into the briefcase, the blood on his right cuff re-appeared, but was no longer there when he was sewing the suit's sleeve (or thereafter). (00:31:38 - 00:32:40)

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Continuity mistake: Leonard washed his hands and some of the blood on his shirt cuffs/sleeves got wet and diluted, but his cuffs/sleeves were dry when he walked out of the room. (00:28:40 - 00:29:05)

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