Revealing mistake: In the dance sequence, we see Elaine twirling Ted around and throwing him into the crowd. Watch the top-right-corner of your screen, as the stunt-double lands in the audience you can see Robert Hays (Ted Striker) in the top-right-corner waiting to pop out. (00:19:10)
Trivia: Towards the end of the credits, there is a paragraph that states "Unauthorized duplication, distribution, or exhibition may result in civil liability and criminal prosecution. SO THERE." (01:27:05)
Other mistake: In the credits, Kareem Abdul-Jabbar's name is misspelled Kareem Abdul-Jabaar. (01:23:40)
Revealing mistake: During the disco scene, Elaine is dancing with a fisherman who was just stabbed in the back. The fisherman has a knife sticking out of his back and you can clearly see the block that the knife is stuck in protruding from his shirt. There are holes from other takes too. (00:18:15)
Visible crew/equipment: In the beginning where the camera is following some of the characters to appear later in the film, when we see the Harii Krishna guys a cameraman and a camera on a dolly track are reflected in a shadow on them for a few seconds. (00:02:30)
Trivia: Director Jim Abrahams has two roles in this movie. The first role was that of the bicycle rider that yells back at Kramer after Kramer hits him on the road. He also plays a role as a solicitor at the airport. He is the one who pauses after seeing how Kramer is treating the other solictors. (00:52:10 - 00:54:55)
Continuity mistake: On the beach, Elaine's hair is semi-wet and fluffy on close shots but soaked and straight in wide ones, and Striker's hair changes to soaked and messy, with two bits of hair sticking out, to wet but not messy. (00:23:50)
Continuity mistake: During the kissing on the beach, the seaweed on Striker's body and the lobster behind Elaine disappear when the second wave comes. (00:24:35)
Visible crew/equipment: At the point where Striker is walking through the tunnel to board the plane near the beginning, for a split second, one can see a section of cable lying on the floor and a crewmember off to the side. (00:04:35)
Visible crew/equipment: In the Disco Dance scene when Elaine is twirling Ted, you see a wire holding him up. (00:19:45)
Revealing mistake: When the plane crashes through the glass at the beginning of the movie, you can't see any wings on the plane. (00:04:30)
Suggested correction: Wings don't sprout out of a plane's nose. They would be significantly further back on the fuselage and out of sight.
Except you can see on either side of the nose, there's nothing blocking the view of the wings. There's no way for them to be so far back that you couldn't see them.
Continuity mistake: After you see all the newspapers talking about the plane, and when you see the drummer on TV who speaks by drum tones, when the drums are handed to him the ends of the sticks are round, but when he looks to HIS left, after the camera changes position, they're not round anymore. (01:04:45)
Revealing mistake: When the Girl Scout crashes into the jukebox, you can see the lights turn on before she hits it. (00:17:10)
Revealing mistake: In the flashback scene in the bar, one of the girl scouts slams the other girl scout onto the floor and one can see the mat that the girl lands on. It had been covered in dirt or dust but when the girl lands it is swept away and you can see one of the corners of the mat. (00:16:40)
Other mistake: When Johnny reads in the folded newspaper, 'There's a sale at Penny's!', the viewer can read the headlines right way up - which means, from his side, he is holding the paper upside down.
Suggested correction: It's a reasonable bet that this was done deliberately as a sight gag. Throughout the movie, Johnny is portrayed as being somewhat 'special'.
Continuity mistake: After the landing, Striker has big sweat stains under his arms and over his chest - but when he leaves the cockpit, his back is completely dry. (01:17:31 - 01:17:59)
