Continuity mistake: When the broccoli is battling the carrot, the bits of broccoli that have fallen off and landed on the mattress change position between shots.
Continuity mistake: When Ben picks up a flier from the ground, the nearby toolbox moves closer to him between shots, and many of the tools on the ground change too.
Continuity mistake: At the dinner table, when Charlie says that he'll get a new job in a week, in one shot Ben is playing with his chopsticks, but in the next he's not.
Continuity mistake: When Kelly first meets Marvin, Kelly's hair changes position between shots of her saying "Hi Marvin, I'm Dylan's mom".
Continuity mistake: When Charlie comments on Ben's drawing, Ben is holding a yellow crayon in his hand. Suddenly in the next shot he is holding a purple crayon.
Continuity mistake: When Charlie is trying to explain a football play to the kids, the little blonde girl moves among the group. Shots showing Charlie's face, she's at his left back side, but shots showing the kids faces, she's directly in front of Charlie.
Continuity mistake: The third time the child services inspector shows up, Phil answers the door wearing excessive make-up, which was the result of a practical joke. In the first few shots , Phil's make-up is actually rather neat, with blue eye shadow, eye glitter, lipstick, etc. But after they enter the house seconds later, the lipstick is messier, the eyeshadow is smudged under his eyes, and the glitter nearly disappears.
Revealing mistake: Phil is not actually playing the guitar when he is singing for the kids. He hits different/mismatching chords at multiple points in the movie.
Continuity mistake: The third time the child services inspector comes, Charlie sees Phil wearing the make-up and drops most the cookies he was carrying, leaving only a few left in the tray. Throughout the scene, the remaining cookies change number and location on the tray.
Continuity mistake: When the contest ends and everyone celebrates, a guy with fuzzy hair next to Charlie falls on the floor, yet a frame later he is up and jumping around.
Answer: When the kid goes up to Marvin and talks to him, he says "Klingo Mach" or something. That means "you speak Klingon?" Then the kid says "Egchad" which means "yes". That thing with the hands means hello or goodbye depending when you use it.