Continuity mistake: When the girl gives Litwak her phone to show him there is a replacement part on eBay, her phones shows that it is connected to WiFi. Litwak doesn't set up his router until later that evening, he has only plugged it in. (00:09:41)
Suggested correction: It's possible she's either connected to wifi at another nearby business, using a public wifi signal, or using a friend's phone as a hotspot.
Continuity mistake: The blue paint blob on the painting changes between shots. (00:47:00)
Continuity mistake: During the fight at Aunt May's house, May knocks Tombstone out of the house with a bat. The subsequent shots have him back in the house.
Continuity mistake: At the end of The Incredibles, when the Underminer shows up, the Parr family don their masks but are still in their civilian clothes, though Bob is about to take off his shirt. At the beginning of Incredibles 2, in the flashback, as soon as the Underminer appears, they appear in their super suits. Also, the Underminer leaves out "I hereby declare war on peace and happiness! Soon all will tremble before me!" (02:00:00)
Continuity mistake: At the premier of Batman's new movie, Batman Again, Robin steps on The Atom and squashes him next to the red carpet. A few shots later, Atom's squished remains disappear from where Robin and the Titans are talking and dancing.
Continuity mistake: Princess Dawn is in her chambers and her servants are preparing her for the coronation. When her book-headed valet tells her "You have come of age", he is suddenly holding the tome with both hands, while he had just one on it before the cut. (00:19:30)
Continuity mistake: At Bibbo's club, he gives Clark and Lois some menus and they have on the cover, the Ace O' Clubs logo on them. When Lois talks about Jimmy eating chili dogs for breakfast, the logo on her menu vanishes. (00:46:40)
Continuity mistake: As the film starts, young Constantine is smoking a cigarette with a close up of his fingers. The camera angle changes and suddenly his fingers are in noticeably different positions. Most obvious is the finger nails are facing towards his left and then his right. (00:00:30)
Continuity mistake: When Jason lunges at Batman with his knife, there is a pile of garbage by the wall where he lands. In the first shot the barrel by the garbage is wooden. But in the next shot it's suddenly a metal barrel/drum. It then changes back to a wooden barrel again. (00:04:20)