Hey Arnold! ( 1996 )

Continuity mistake: When Helga is backstage preparing for the play, there is an "H" on the left side of her costume. When Phoebe tells her that she's on, she turns around and the "H" is not on her costume, then reappears a moment later. (00:03:32)

Other mistake: When Helga tells Phoebe how much she hates Thanksgiving backstage during the play, the third time Phoebe says, "Helga," the background is of Helga's living room, not backstage. (00:03:38)

Continuity mistake: When the play finishes and all the kids are standing on stage, Arnold and Helga are holding hands. Arnold looks at Helga, and Helga pulls her hand away. When the shot changes, they are holding hands again. (00:05:17)

Continuity mistake: When Arnold's family is sitting around the table on Thanksgiving, there is a blue bowl with a spoon in it where Arnold is sitting. A few shots later, the bowl changes to white, and the spoon is gone. In the next shot, the bowl is blue again, and the spoon is back. In the shot after that, the spoon disappears again. (00:06:34 - 00:07:08)

Other mistake: When Arnold is in his room putting on his costume, his reflection in the mirror shows his buttons on the left side of his clothes. Then, when Arnold answers the door, his buttons are on the same side; the reflection was not reversed. (00:09:26)

Continuity mistake: When Joey is shown in close-up, his missing tooth looks like it's there but it's covered with something black and his missing tooth keeps reappearing and disappearing in the last scenes.

AidanN

Upvote valid corrections to help move entries into the corrections section.

Suggested correction: Joey never appears in this episode.

Helga's Show / The Flood - S3-E15

Audio problem: The Flood: When the kids go into room 315 looking for Mr. Simmons, Arnold calls out his name, and his mouth does not move. (00:20:24)

Phoebe Takes the Fall / The Pig War - S3-E16

Helga's Show / The Flood - S3-E15

Continuity mistake: Grandpa's rubber raft got much bigger between the time he left the greenhouse and the time he arrived.

AidanN

Revealing mistake: Phoebe Takes the Fall: When Phoebe is in Helga's room helping her study for the tournament, as Helga says, "Well, let's call it a night," her left side hair is missing, then it appears mid-shot. (00:06:54)

Girl Trouble / School Dance - S3-E18

Other mistake: Girl Trouble: When Phoebe says she has costume designs for the Mandans, the Chinook, and Sacagawea, Gerald says, "I could have sworn it was Sacagawea." Then, there is a shot of Helga and Phoebe, but there is a problem with this shot. What we're supposed to see is Helga and Phoebe sitting in their seats at their side of the table. Instead, the background is of Arnold and Gerald's side of the table, while Helga and Phoebe are shown in front of the table, which doesn't make sense. (00:02:31)

Girl Trouble / School Dance - S3-E18

Other mistake: Girl Trouble: When Arnold comes home after his rough day at school, his hair clips through the wall as he walks in the door. (00:04:39)

Girl Trouble / School Dance - S3-E18

Continuity mistake: Besides the fact that when Helga is sharpening her pencil, the desk arrangement changes, one of the students visible when she looks at Arnold is... Helga. This happens because the shot is taken from the episode "Helga's Love Potion."

Continuity mistake: When Arnold is getting his lunch, his tray is empty. When he picks up the cup of green stuff and Helga gets mad at him, a milk carton appears on his tray. (00:00:29)

Other mistake: After Helga gets mad at Arnold in the beginning, as Helga says, "What an annoying little smarty pants know-it-all," the lunch lady's body is invisible through the glass on the counter, leaving only her upper half visible. (00:01:12)

Continuity mistake: When Mr. Simmons tells the class about the Romeo and Juliet play, the projector has four legs. When the class is watching the presentation, it has three legs. Then when the kids leave the class, it has four legs again. (00:02:38)

Continuity mistake: When Mr. Simmons tells the class that they are welcome to come and try out for the play, there is no cap on the projector. When the kids start to leave, a cap appears on it. (00:03:18)

Continuity mistake: In the auditorium, when Mr. Leichliter claps and starts talking to Mr. Simmons, the location he is standing in changes three times. (00:05:19)

Continuity mistake: In the auditorium, when Mr. Leichliter says, "Indeed, it is I," there is no exit door on the wall to the left of him. In the next shot, an exit door appears on the wall. Later on, in a wide shot of the auditorium, the door is gone, and there are now double exit doors on the perpendicular wall. (00:05:22 - 00:05:57)

Continuity mistake: Lila's collar is gold throughout the episode. When the girls audition for the part of Juliet and Mr. Simmons says that they were all very good, her collar is white, and her gold button is missing. Then when Mr. Simmons says Lila will be the third understudy, her collar is gold again, but her button remains missing. Later on, when Mr. Simmons announces Lila will take the role of Juliet, her collar is white again, and her gold button is missing again. (00:08:46 - 00:14:26)