Revealing: In the soda shop, the waitress turns off the lights with her elbow because her hands are full, but she misses the light switch by 6 inches.

Continuity: At Frenchie's sleepover when they are talking about piercing Sandy's ears, it shows Sandy holding the wine bottle and passing it to Jan. Then it cuts back to Sandy and she is still holding the wine, then it cuts back to Jan and she has the wine again.

Audio problem: During "We go together" at the end of Grease, John Travolta's mouth is not in sync with the words.

Continuity: At the dance, there's a scene where everyone started dancing after Cha-Cha and Danny won the trophy. Well Marty comes in from the side of the screen and lands on the floor in some kind of split, and you can clearly see she is wearing knee pads.

Continuity: In "We go together" they all dance forwards. When the camera changes angle Frenchy and Doody have switched sides.

Continuity: In the middle of the dance contest, Patty Simcox does a funny front walkover, and comes dancing towards the camera. Over her shoulder, you can see Sonny running up behind her. But suddenly it cuts to another angle, and someone else is running up behind her to lift up her dress, and Sonny is nowhere to be seen.

Continuity: In the scene where the whole gang is eating at the soda shop, everybody starts leaving. Doody is in the back, in the middle, on the railing. He's getting ready to leave, takes a bite of his ice cream and sets it down. In the next shot, he sets it down again.

Continuity: Sandy walks over to meet the girls after doing a cartwheel. On Sandy's cheerleading uniform, there is a LONG red string right next to the letter on her shirt. Then, suddenly, the string disappears in the very next shot.

Factual error: When the Pink Ladies are walking Sandy into the outdoor cafeteria, just after she tells them the name of the boy she met last summer, all the cars in the background are from the 70's, not from the late 50's or early 60's. This actually happens twice in the same scene.

Continuity: There is a scene in which Danny falls over a hurdle. If you watch his falling frame by frame you will notice that only his right leg is stretched first. Then the camera angle changes and suddenly his left leg is stretched, while the right one is bent.

Visible crew/equipment: In the soda shop scene where Sandy and Danny are at the jukebox, the reflection of the boom mic is clearly visible in the chrome part of the jukebox.

Continuity: When Kenickie is first shown, he has two charms on his necklace. One is a small square one, the other is a star inside a circle. The camera cuts to Zuko, then when it cuts back to Kenickie, the square charm is gone. It reappears in a couple of scenes later in the movie, then disappears again.

Continuity: During the slumber party at Frenchie's, when Rizzo brings out the wine, check out the junk on the headboard. Later in the scene when Marty is putting on her robe, the headboard is clear and now has a black fan on the left. Then even later when Jan says "You ain't getting your hands on my ears" the headboard is cluttered again, with the black fan too.

Continuity: When "Crater Face" comes to the dance with Marty and Rizzo, he takes his sunglasses off twice.

Continuity: When Marty is talking to Vince Fontaine before the dance contest, towards the end of their conversation she starts to lift up her purse with her right hand. But suddenly it cuts to another angle, and her arm is down.

Revealing: On the first day of school, when Patty is starting to sit down next to Sandy, her reaction to sitting on the apple is way too early.

Revealing: The TV set that is in the scene when Jan sings, "Brusha Brusha Brusha" is not the same TV that is shown when Rizzo is getting ready to go out the window during the slumber party.

Other: In the scene where Sandie is at the shop with the jock, then she goes to the jukebox, the picture behind the jock is all blurred out. You can tell it is a Coke sign - obviously a clash of sponsors.

Continuity: At the beginning of the National Bandstand scene you see people filling the hat of the big "Rydell Ranger" figure with pieces of paper. During the next ten minutes the figure is often visible in the background and the hat is empty - nobody emptied it. After those ten minutes the hat has paper again and is then emptied.

Factual error: In the scene where Danny is talking to Sandy at the Frosty Palace, the jukebox behind them is a 1973 model, but the film takes place in 1959.