Visible crew/equipment: During the flashmob, there are people walking toward the camera while dancing on the street. The shadow of the steadycam filming the scene is left of screen.
Continuity mistake: When the roasted marshmallow landed on the back of the camper's head, it was relatively flat and spanned from the middle top to the right top/side with some charred marshmallow splattered almost to the center of the man's head. After a camera shift, the marshmallow was sticking up near the right top of the man's head, was shaped like a whole marshmallow, and was still largely white instead of mostly black/charred. (00:35:19)
Continuity mistake: During the "Good Afternoon" number, Ferrell and Reynolds are standing in front of horses. They're fairly close to the two. The scene changes and the horses are further away.
Revealing mistake: Driving home from meeting Gigi, there is an image on the windshield of a blue handicapped parking permit/placard that is supposed to be hung on the rearview mirror, but there is no placard hanging - the permit's image is superimposed on the windshield. The image even briefly appears and reappears. (00:34:05)
Deliberate mistake: Elizabeth will not be able to save Mateo from falling backwards into the fire pit by grabbing his hand or pulling him back after his whole body is suspended over the edge. (01:13:47)
Continuity mistake: When the waiter puts Lily's "Cleopatra Special" plate in front of her, the long, white, curved ingredients (bean sprouts?) stick upward across her plate, but none are visible or sticking out in alternating views of her plate. (00:08:30)
Factual error: Josephine walks away from her father King Louie 14th, after he tells her she has to marry the young Duke Lintillac for his money. When you look at back of Josephine, you can see a zipper in her skirt. King Louie 14th was King from 1643 until his death in 1715. The first zipper was invented was in 1851. The zipper being used as we know it present day was invented in the early 1890s by Whitcomb L. Judson. (00:55:57)