- Coloring error: When Mikey asks T.J. where the lockers went, Gretchen's sleeves turn blue.
- Animation error: When T.J. walks towards the dark stairway that leads to the hidden room, his legs disappear for a few frames.
- Continuity error: After Gretchen tells the others that she had read the books, one of her pigtails pops-up from the back of her shoulders to front. This happens in plain sight while she is saying "after math before bed".
- Continuity error: While Gretchen is opening the door to the hidden room, there are no spider webs. When the door is seen from the inside, there is a spider web hanging from the door frame. The spider web also disappears while the perspective shows Mikey and Gus, but reappears afterwards.
- Continuity error: When the gang is looking for the hidden room, both Vince and T.J. are wearing a single white glove. Vince's glove disappears while he screams "a velociraptor!". His glove reappears afterwards. This could be a coloring error instead.
- This was the first episode to premiere in the new millennium.
- This is one of only six episodes of the television show Recess that were directed by both Sheetz and Parkins, the two prominent directors of the series.
- This episode was cut from the Italian dub.
- This episode premiered as part of "Mystery Day" on Disney's One Saturday Morning. Along with this episode, other episodes from the block that were mystery-themed were the Pepper Ann episodes "Effie Shrugged/Mom Knows What P.A. Did Two Nights Ago", and the Sabrina, The Animated Series episode, "Truth or Scare".
- The Barnaby Boys appear to loosely resemble The Hardy Boys, a duo of fictitious, mystery-solving sleuths whose exploits are covered in a book series of the same name. Of the two brothers, Frank was portrayed by T.J. and Joe was portrayed by Vince.
- The police officers appear again in the 2001 feature-length movie, Recess: School's Out.
- T.J. Detweiler - Andrew Lawrence
- Vince LaSalle - Rickey D'Shon Collins
- Ashley Spinelli - Pamela Segall-Adlon
- Gretchen Grundler - Ashley Johnson
- Mikey Blumberg - Jason Davis
- Gus Griswald - Courtland Mead
- Randall Weems - Ryan O'Donohue
- Menlo - Blake Ewing
- Earl Ramen - Brad Garrett
- Officer - Gregg Berger
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