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Trivia: According to creator Craig Bartlett, Helga's appearance was inspired by old childhood photos of Frida Kahlo.

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April Fool's Day - S5-E14

Trivia: In this episode, Sid is voiced by Taylor Gifaldi, the younger brother of Sam Gifaldi, Sid's original voice actor. Sid was recast because Sam Gifaldi went through puberty.

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Casa Paradiso / Gerald's Tonsils - S3-E3

Trivia: During the show's production, Gerald's voice actor, Jamil Walker Smith, went through puberty, which drastically deepened his voice. Since the production staff couldn't find a suitable replacement for Gerald, the episode "Gerald's Tonsils" was made to explain Gerald's voice change and allow Jamil to play Gerald for the remainder of the series.

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Dinner for Four / Phoebe Skips - S4-E5

Trivia: These were the last two episodes to be made with traditional cel animation, before switching to digital ink and paint.

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Timberly Loves Arnold / Eugene, Eugene! - S5-E22

Trivia: In "Timberly Loves Arnold", when Timberly shows Arnold her flower drawing, as Sid says, "Look, it's a flower named Arnold," part of his shirt is invisible in the first frame of the shot. This can only be spotted in slow motion or with pausing, therefore it's under trivia. (00:02:22)

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