Continuity mistake: In the scene when Sean breaks down Lily's bedroom door and catapults into the room, there is a poster on Lily's wall across from her door. The poster goes from hanging properly to one corner untaped as the shot changes.
Grounded for Life (2001)
1 mistake in Action Mountain High - chronological order
Starring: Donal Logue, Kevin Corrigan, Megyn Price, Lynsey Bartilson
Genres: Comedy
Henry Finnerty: Wow, that ride must be really scary. Those two guys are holding hands.
James "Jimmy" Finnerty: That's the line for cotton candy.
Trivia: Megyn Price plays Claudia Finnerty, mother of Lily Finnerty (Lynsey Bartilson). In real life, Price is only 12 years older than Bartilson.
Jimmy Was Kung-Fu Fighting - S1-E12
Question: How can Sister Helen give Lily detention when she sees Lily's tongue ring? She is at the Finnerty's house. Piercings are often a violation of school dress codes, but Sister Helen has not seen the piercing while at school.
Answer: It happens. One of my middle school/junior high classmates was suspended for fighting another classmate during the weekend, at a location nowhere near the school. Also, after Jimmy and Lily created the fake image of Sister Helen, it's easier for Sister Helen to get away with assigning an unfair detention.