Continuity mistake: During the rampage through town, the driver of a red Ford parks and then runs out in panic. In one shot, the license plate number is AZP-281. In the next shot, it is SLP-281. (01:07:16)
Continuity mistake: After Judy is shot by the poison flower, Peter cradles her in his arms. That is in close-up. When it goes to wide shot, he isn't cradling her anymore.
Continuity mistake: When Judy is fighting off the spiders, the floor breaks and a purple plant comes out of the floor and shoots her in the neck. You can see the barbs, but in the next shot when her brother starts running toward her, they magically disappear, and in the next shot they appear again. (01:30:30)
Continuity mistake: In the scene in which an ambulance wrecks the back of Judy and Peter's realtor, the license plate on the front of their car reads DBA-454. However, in the scene where Carl finds his car wrecked into a tree, when he backs out, his license plate also reads DBA-454. (00:38:50 - 00:52:35)
Continuity mistake: When Van Pelt shoots the tire shelf in the store, the attached red wood triangle support is actually different between shots - note paint and dings. Furthermore, dirt marks on the tires appear, and two of the slotted heads of the screws, that are screwed into the anchor eye plate, are turned facing opposite directions (before it breaks). (01:09:25)