The Casagrandes | The Loud House Movie | A Loud House Christmas | A Really Haunted Loud House | The Really Loud House
- Acting for Two:
- Brian Stepanek reprises his roles as Lynn Sr. and Todd from the animated series, and voices the Vampires of Melancholia narrator in "Heart and Soul" and Fearless Pete in "Home is Where the Hero Is".
- When programmed with Lincoln's voice in "The Macho Man With the Plan", Todd is voiced by Wolfgang Schaeffer, who also plays Lincoln.
- While uncredited in both instances, Aaron Rogers stood in for Keeshan Giles as Chief Wellington in "The Chore Thing" before appearing as Mr. Uggo in "The Princess and the Everlasting Emerald: A Royal Woods Fairytale".
- Anthony LeBlanc voices an announcer in "The Manager with the Planager" before appearing as an MC/barista for the Burnt Bean in "Heart and Soul".
- In "The Tennessee Surprise: Love Is In the Air", Jolie Jenkins plays Rita and voices Mrs. Pittman.
- Creator Cameo:
- In "The Chore Thing", executive producer and director Jonathan Judge voices the police dispatch.
- In "The Manager with the Planager", director Phill Lewis plays Mr. Rickshaw.
- Similarly, in "I Wanna Hold Your Hand", co-executive producer and writer Matt Flanagan voices a high school teacher in Rita's flashback.
- The Original Darrin: In the Italian dub, Giada Bonanomi reprises her role as Lily after being replaced by Sofia Fronzi in A Loud House Christmas.
- The Other Marty: The initial casting announcement stated that Muretta Moss would reprise her role as Rita from A Loud House Christmas. Jolie Jenkins ended up getting cast instead.
- Out of Holiday Episode: “What’s a Mother to Redo?” is a Mother’s Day episode but aired in early June.
- Time-Shifted Actor:
- In "Heart and Soul", Justin Allan and Ava Torres respectively play younger versions of Wolfgang Schaeffer (Lincoln) and Sophia Woodward (Luna).
- Similarly, "Spelling and Doorbelling" has Parker Quinn Werdann as a younger version of Catherine Bradley (Luan).
- In "Little-ol-lady-whoooo Has Talent", an unidentified actress appears in a photo as a younger version of Lexi DiBenedetto (Lori).
- In "Last Friend Standing", Nyomei Valentina Lara appears as a younger version of Annaka Fourneret (Lynn).
- In "Louder by the Dozen", Levi Mynatt appears as a younger version of Jahzir Bruno (Clyde).
- Two Voices, One Character:
- Todd is normally voiced by Brian Stepanek, but when he's programmed to have Lincoln's voice, he's voiced by Lincoln's actor, Wolfgang Schaeffer.
- Mr. Coconuts, a ventriloquist's dummy, is normally voiced and operated by Luan's actress, Catherine Bradley. However, in "Sweet Dreams Are Made of Cheese", his human form is portrayed by Jack McQuaid.
- In "The Tennessee Surprise: Love Is In the Air", Clyde, played by Jahzir Bruno, briefly does an impersonation of a radio DJ, voiced by Steven Goard.
- Uncredited Role:
- While Lily is played by two actors, only August Michael Peterson is credited while Emily Ford is not. Ford is credited in A Really Haunted Loud House, but even then, she's listed in a block of name credits for stand-ins.
- In "The Macho Man with the Plan", archive audio of Morgan McGill yelling, "Hey, Stinkin'!" from A Loud House Christmas can be heard in the opening scene, though she isn't credited.
- In "The Chore Thing", the actors who play Milkshake Marty's goons (including Charles Ash, who plays the Caucasian goon) and Auntie Pam are uncredited. Likewise, Chief Wellington was played by two actors in the episode, but only Keeshan Giles was credited; Aaron Rogers revealed his casting as a stand-in for the actor via social media.
- In "The Blemish Dilemish", the roles of J Diego Gonçalves as the mailman and Jaxon Presley Karim as the boy wearing a shirt too small for him are uncredited.
- In "The Manager with the Planager", the actors who portray two senior citizens, Ronnie and Leon, are uncredited.
- In "The Banana Split Decision", the actors who play Natalie, Ethan, and Ms. Hamilton are uncredited, as is Jeff Bennett as the voice of Mick Swagger (who is at least justified in that the episode just uses archive audio from the animated series).
- In "I Wanna Hold Your Hand", the actor who plays Cannonball Wilson is uncredited.
- Neither of Charlie's parents are listed in the credits of "The Princess and the Everlasting Emerald: A Royal Woods Fairytale". While Mr. Uggo's actor, Aaron Rogers, revealed his casting through social media, Mrs. Uggo's actress remains unknown, as she is likewise not credited in her off-screen voice cameo in "All Is Fair in Love and Sleepovers".
- In "Home Is Where the Hero Is", Samantha Christine is uncredited as one of Taylor Wedge's cronies.
- In "Spelling and Doorbelling", the actors who play most of Lincoln and Clyde's previous ding-dong ditch victims are uncredited.
- In "Little-ol-lady-whoooo Has Talent", the actors who play Mrs. Torkelson, Matthew Torkelson, Charlie (a male dancer) and all of the talent show judges are uncredited. A younger version of Lori and fifteen other former pageant winners (including Emily, Meghan, Coreen, Jackie, Sofia, and Jennifer) also appear in photos on a bulletin board, and the actresses in the photos are likewise uncredited.
- In "A Musical to Remember", the actors who play the members of Bobby's band are uncredited. Damian Alonso revealed three of the actors, namely Greg Wapnick, Abby Bluestone, and Keionah Lee, via Instagram, while the fourth actor remains unknown.
- In "Last Friend Standing", the actors playing the guests from the sleepovers Lynn crashed when she was younger are not credited.
- In "Louder by the Dozen", the actresses playing Lori's college friends (addressed in the episode as Tani, Tammy, Toni, Tiffy, and Tori) are uncredited.
- Working Title: It was simply referred to as The Loud House Live-Action Series during production.
- You Sound Familiar:
- Jack Griffo, who voices Blake Bradley in the animated series, plays Ro-Bro in "Ro-Bro".
- Stephen Tobolowsky, who voices Principal Huggins in the animated series, plays Walter Phillipini in "The Princess and the Everlasting Emerald: A Royal Woods Fairytale".
