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: After Lex blasts Doomsday through a globe statue into some steps, and then flies over to him to smack into him some more, it shows the rubble around Doomsday. In the close up, the damage around him and amount of rubble decreases. (01:04:15)
Continuity mistake: At the table when Constantine is talking with Chas, they mention him throwing up on his aunt at a wedding and Constantine says he thought she took it fine. He lowers his hand with his cigarette pointed down in the close up. But in the next angle it's suddenly pointed up. (00:05:35)
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)
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)