Legs and Co. - S1-E3
Visible crew/equipment: When Shirley and Todd come into the house with their broken legs, they talk to Tom and Linda. Close-ups of each actor are shown when they are talking, but when we cut to wide shots of all 4 of them, the boom mike is shown at the top of the screen several times.
Laugh, Ed, Laugh/It's Way Ed - S1-E10
Continuity mistake: In "Laugh, Ed, Laugh", when Eddy is gambling with squirrels, he picks up a bunch of nuts, primarily acorns and only a couple of peanuts. But next shot later when he yells, "Suckers!", there are more peanuts shown. (00:05:00 - 00:11:15)
Character mistake: In the final episode, Carlos visits Doc in the psychiatric hospital for advice concerning his upcoming marriage to Holly. While talking, Carlos refers to Doc's deceased wife as "Linda", while throughout the series, it has been made very clear that her name was Deborah.
Plot hole: In each episode, Emmy, and Max travel to dragon land (often for a long time) without their parents ever knowing. This makes no sense. Their parents would notice sooner, or later that Max, and Emmy always go in, and out of the house, or that it's always quiet in Emmy, and Max's playroom. You'd think Emmy, and Max's parents would get suspicious, and would question their children accordingly.
Character mistake: Season 3, Episode 2 "Squirmy". Little Bill and his brother, Bobby are returning his pet earthworm to the soil. Bill calls his brother by the name Jamal. Jamal is Little Bill's baby cousin.
Continuity mistake: The professor knocks a hole in the side of a tunnel and hot water and steam gush out. The group is then distracted by a boulder traveling through the tunnel. After the boulder passes, there is no longer any steam or water gushing from the hole in the wall.
Continuity mistake: Emma falls off the roof and into a water butt when she is being chased by the villains, the police pull her out and she is soaking wet. A few seconds later she screams when the villain catches Nicola, and when they fall through the roof she is dry.
