Continuity mistake: The bite marks on Doc's sandwich were inconsistent/contradictory. Doc took a corner bite out of his sandwich, then the sandwich was shown with an additional side bite mark (made off-screen?). When the sandwich was shown again, the distinctive bite marks were gone and the side of the sandwich that had been eaten was straight across. Doc was holding the sandwich in his right hand; after another camera shift, Doc was holding the sandwich in his left hand and the unique side bite mark was back. (00:18:22 - 00:18:48)
Factual error: Sam Cooper's Rx label was for Alprazolam (generic Xanax) 2 mg, qty #150, refill 2x, and "take 1 tablet by mouth as needed." "Must last _" length was not visible and there could have been warning stickers (may cause drowsiness) on the other side. However, Xanax is a fast-acting tranquilizer which should last 6 hours and the dosage should not exceed 10 mg per day. The instructions to "take 1 tablet by mouth as needed" should have had restrictions attached to prevent serious side-effects/death. (00:49:38)
Other mistake: It had been (acid) raining for some time and a puddle along the curb was shown with brown (Fall) leaves in it. If the acid rain was dangerous enough to eat away human flesh, it should have been powerful enough to erode/destroy the fallen leaves soaking in the puddle full of acid rain. (01:02:10)
