Continuity mistake: When the movie starts with all of Mike's friends in the house, one of them picks up some snacks while someone speaks on the phone, yet in the inmediate angle from behind his hand is lowered.
Continuity mistake: When ET gets beer from the fridge, he tosses food at the dog. The dog is always close to the fridge, by the oven, except for the shots where he is tossed the potato salad, where he is several meters behind, on a rug by the cupboards. This change of position swaps back and forth.
Revealing mistake: When ET is grabbing things from the fridge, in the close-up his fingers swap from thin and long to chubby and short, obviously a puppeteer's glove.
Continuity mistake: While ET is reading the ABC book and brings life to the wilted plant, the position and number of the leaves and flowers are completely different between the front and back shots.
Continuity mistake: When Elliot grabs the jar to free the frog, the frog stretches up and climbs the side, yet a frame later, from a different angle, it's sitting on the bottom of the jar.
Continuity mistake: When the final bike chase starts, the kid with the blue ski mask who cries "We made it!" changes positions 3 times in less than 2 seconds: 1) To the left of a kid with a red hat, both behind the one with a cap. 2) To the right of the one with a cap, riding parallel to him. 3) Behind everyone, completely alone.
Continuity mistake: After drunken Elliot sinks down his chair, he raises and looks at the girl, his left arm on the desk. A frame later, from the opposite angle, the arm is down.
Continuity mistake: When the kids are running away from the cops, the way the white blanket is folded around ET differs between the wide shots and the close-ups.
Continuity mistake: When Elliot and the bikers are about to fly, Elliot closes his eyes and there's a close-up on ET's eyes, which reflect a group of people running in front of him. From a wider angle, a frame later, there are two cars with 2 cops standing, no men running.
Continuity mistake: While escaping from the cops, right before ET makes the bike fly, Elliot is pedalling standing away from the seat, half a meter above ET's head. A frame later, from the front angle, he is seating, his head at ET's level.
Other mistake: When one of the bikers escaping from the cops cries "We made it!", 15 men appear from each side. Plus, there's a dozen or so police cars in front, as it is later revealed. Although this adds up for more action and suspense, it is absurd to believe neither he nor any of Elliot and Mike's friends saw none of them.
Continuity mistake: When the van enters the playground, the 3 friends and their bikes are parallel to each other. A frame later, the guy with a red cap is several meters behind.
Continuity mistake: The van reaches the playground, skids and white chunks fall off the rear, covering the grass. When the angle changes, the grass is clean and the chunks are falling down again, though much less amount than before.
Continuity mistake: When the van enters the playground, a woman in blue walking by the curb suddenly disappears in the following angle.
Continuity mistake: At the end, when ET tells Gertie to be good, the plant disappears, only to reappear in the next angle.
Continuity mistake: Elliot shows ET where home is and a close-up shows ET's hands very close together fidgeting with a red object. When the angle changes, the hands are way apart, and the object is gone.
Revealing mistake: After Gertie says she doesn't like ET's feet, Elliot scolds her and she mouths his lines.
Audio problem: When Elliot frees the frogs and cries "I gotta save you, I gotta let you go!", his lips aren't moving.
Visible crew/equipment: When drunken ET is about to grab the comic book, watch the microwave door. Right before the angle cuts, someone's moving shadow is reflected.
Continuity mistake: When ET is about to drink beer, the kitchen towel next to the fridge changes positions between shots, notice the folding of the pattern.
Chosen answer: They actually are smoking and there are cigarettes on the table.
Mike K